Grant McWilliams

10 items tagged "Tech"

  • Crime preventing skirt

    In Japan women are attempting to stop being victims of crime by hiding from their pursuers in plain site. They wear a skirt that turns into a full size cloth vending machine!

    Hopefully they don't avoid one criminal only to find another breaking into vending machines. Original story at the New York Times .


  • Facebook CentOS Mirror

    I was updating a CentOS OS and I noticed that one of the mirrors it chose was so out of curiousity I put that into my browser and this came up. Does Facebook have extra bandwidth and storage they don't know what to do with?

  • Hardware AES Showdown - VIA Padlock vs Intel AES-NI vs AMD Hexacore

    Back in the old Amiga days we knew the value of specialized processors for specialized jobs. The Amiga could do things that computers with 10x the power couldn't do. However when it got to something that it's specialized processors weren't designed for it was slow again. The first time the Intel CPUs added a special processor into the CPU was in the i486 days and that processor was the floating point co-processor. Before the integration floating point math was handled by a special chip on the motherboard or by software routines. The hardware floating point math was somewhere around 20 times faster than in software. Every once in a while Intel and Amd added additional instructions that would speed up some function. Most of these instructions where multimedia related (SSE, 3DNOW) and none of them effected my life any. Fast forward to 2005 or so and we see VIA the underdog in the Intel x86 race add instructions in it's CN400 chipset to speed up encryption algorithms. So for one particular function (AES encryption/decryption) this CPU/chipset combo was blazing fast but for everything else it was still dog slow. Interesting idea but poorly executed perhaps. I did build a mini-ITX router using the VIA chipset. With VIA Padlock providing hardware encryption/decryption it's been great for SSH, OpenSSL and AES disk encryption via Cryptsetup. It however, doesn't make a very fast desktop computer.


    Intel has grabbed this idea of hardware AES support and added it to their new CPUs. CPUs that in their own right are fast enough to be useful so I picked up a 2.5 ghz Core i5 system. My main desktop computer is an AMD Phenom II 6 core system at 2.8 ghz which I'll be using as a baseline. It's fairly fast but has no hardware crypt support. I'm going to demonstrate some typical benchmarks to show the general speed of each CPU then focus on the hardware crypt support using OpenSSL, OpenSSH and Cryptsetup.


    Before you get all excited because you have a recent Intel CPU and you think it has AES-NI in it you might want to check Intel's beta comparison chart (which seems impossible to find by googling) at You can also use this comparison to check other options in the CPU like VT and VT-D. I keep this chart bookmarked before I make any purchases of Intel CPUs otherwise I'd end up with a bunch of stuff I don't want. Do NOT assume anything when dealing with Intel. For instance the Core i5-460 does NOT have AES but the core i5-560 does which sort of makes sense since the i5-560 is a bigger more powerful CPU right (as shown by the bigger model number)? Not necessarily true as seen by a weirder example - the Core i5-650 (AES-NI) and the Core i5-750 (No AES-NI). Why would a more expensive, more powerful CPU with a higher number not include AES-NI? I don't know, ask Intel.


    To show the differences between hardware and software encryption I've prepared three computers without hardware crypt support and two that do. The company that started it all was VIA with their padlock instructions in their CN400 chipset so I've included an Epia SP Mini-ITX motherboard sporting a Via C3 at 1.3 Ghz and 1 GB of DDR ram. As a reference I've included a basic MSI Wind netbook with an Intel Atom 230 at 1.6 ghz. I don't expect much of anything out of this dog slow CPU but I think what we'll see is how much encryption impacts it and even though we may choose not to do full disk encryption we may connect to a VPN or log into https websites and feel the pain. The other CPU with hardware encryption instructions is the new Intel Sandy Bridge Core i5-2520 at 2.5 Ghz. This has the aforementioned AES-NI instructions which should speed things up nicely. The Core i5 is a dual core CPU so for contrast I've included an AMD Athlon II X3 - a triple core CPU running at 2.9 Ghz. With another 400 mhz and an additional core this should give the Core i5 some competition. Lastly I've included an AMD Phenom II X6 - a hexacore beast running at 2.8 ghz which through brute force should be able to turn some pretty good numbers.


    VIA Mini-ITX

    VIA C3 @ 1333 mhz

    CN400 Chipset

    1 GB 400 mhz DDR ram

    Intel Netbook

    Intel Atom 230 @ 1600 mhz

    1 GB DDR2 ram


    AMD Athlon II 435 @ 2900 mhz

    2 GB ram

    Intel AES-NI

    Intel Core i5-2520 @ 2500 mhz

    8 GB of ram

    AMD Hexacore

    AMD Phenom II X6 @ 2900 mhz

    4 GB of ram


    Baseline Benchmarking with Passmark

    The first test is a general benchmark to demonstrate the overall performance of the systems. The passmark statistics can be found at

    The interesting thing to note about this chart is the incredible speed Intel is getting out of each one of it's i5 cores. The Core i5 has 2/3 the performance of the Phenom X6 with 1/3 the cores and at a lower clock speed. This is very impressive. The Athlon II doesn't fare so well against the Core i5 and I think it's safe to say both the Atom and the C3 are dog slow. You don't realize how bad the Atom is until you compare it to a run of the mill desktop CPU and realize it has about 1/10 the power. It has to be noted that the Atom and C3 only have one core but still one core in the Core i5 are 6x times faster than one core in the Atom. Just for kicks I looked up the speed of an ancient AMD Athlon 2600+ from 8 years ago which we wouldn't even think about building a computer out of now it trounces the Atom! The Atom uses less electricity and costs pennies to make which is why it exists.



    Our first encryption specific test is using openssl's benchmark argument. I've tested both the aes-128-ecb cipher and the aes-128-cbc ciphers and only posted the results for 8192 Byte blocks.

    Woh! Our next to worthless VIA C3 puts a big lump on the Hexacore! In fact the VIA C3 beats the Hexacore in both tests by as much as 50%! The numbers for the VIA C3 are VERY impressive. For a CPU with 1/30th of the power of the Phenom II X6 it's pretty fast for doing this one thing. The Intel Core i5 pulls ahead by a good margin using it's hardware AES-NI instructions which is expected with a 2x - 10x speed improvement over the Hexacore.




    Truecrypt 7.0a has support for AES-NI but not for Padlock which shows up in the VIA C3's horrible results. Ten MB/second encryption speed isn't worth anything.  I also included results for Twofish with no CPU provides hardware acceleration for which shows the advantages of having hardware crypt support. The Atom is dog slow as we'd expect but almost usable. You could encrypt a USB thumb drive and not notice the impact too much outside of your CPU going to 100% when you write to it.

    The Hexacore is about 3x times faster than the X3 which is interesting as it only has twice the number of cores. I can't really explain that one. However the Core i5 pulls ahead by quite a large margin but only because of AES-NI. AES speed is about 2.5x that of the Hexacore which is VERY impressive for a 2 core CPU pulling off 1.9 GB/sec average encryption/decryption speed. However, using twofish as the cipher shows the hexacores muscle and is roughly twice as fast as the Core i5.


    Real World Benchmarks

    Benchmarks are fun to look at but what we really need is a real world test - although the bars here are not to scale I'm afraid so you'll need to use the numbers. For a real world test I could just encrypt a volume and write to it but the results across this wide range of hardware would be irrelivent because the disk systems and drives themselves are vastly different in speed. So to create a more fair playing field and focus on the encryption abilities I've created a 400 MB ramdisk, then created a file inside and using losetup attached it to a loopback device. Once I have the loopback device I can format or encrypt the device as I please. To limit human error I've created a script named that I used to automate this process on each machine. This script is available in the Bash Downloads section.


    The commandline I used to do the actual encryption is as follows

    cryptsetup -q -c aes-cbc-essiv:sha256 -h ripemd160 luksFormat /dev/loop0 ./secure.key


    The secure.key file you'll need to create yourself if you want to duplicate this benchmark. You can make a keyfile by reading data out of /dev/urandom. I won't get into how secure this data is here as I'm mainly interested in testing speed. If you want to Cryptsetup or Truecrypt in production you may want to research keyfiles more thoroughly. It should be noted that Truecrypt has a decent keyfile generator.

    sudo dd if=/dev/random of=./secure.key bs=1 count=256


    Once I had an encrypted device in ram I used dd to write a large file into it using the following command string

    dd if=/dev/zero of=/media/cryptdisk/bigfile.bin bs=10240 count=25000

    I found in my research mentions of Padlock needing it's data aligned in order for the hardware encryption to do it's job. I didn't have time to research this but if anyone has an insight I'd like to hear it.

    There's a couple of things to note here. The encryption/decryption numbers I got from the software decryptors were rock solid in that they varied very little. The numbers I got from from Core i5 varied by 100 MB/sec and even put encrypted ramdisk speed higher than unencrypted ramdisk speed part of the time.  I'm not sure why this variance exists so to get as reliable numbers as possible I ran it a bunch of times and took the average for both encrypted and unencrypted ramdisks. Maybe the variance has to do with immature drivers or possibly even bottlenecks in the CPU that don't always appear. At this point it's just speculation.


    The other question these numbers brings up is what happened to Padlock? We can write to our ramdisk at 111 MB/sec but when encrypted we can only write at 31 MB/sec even with hardware encryption? To get some answers I ran some more tests just on the VIA C3 where I stressed the write speeds of the ramdisk, the mounted loopfile in ram and the encrypted loopfile in ram. This shows something very interesting, the C3 doesn't seem to have enough CPU power to handle the overhead of several layers of filesystems and loopbacks. This is a guess of course but you can see that we can write to the ramdisk at 111 MB/sec but to a mounted ext2 formatted file in ramdisk is just 44 MB/sec. We lost 67 MB/sec just in that process so something is a little off. We only lost another 13 MB/sec in the encryption process. I also tested writing to a hard drive partition, a loop device inside a hard drive partition and an encrypted loop device in a hard drive partition. According to hdparm the drive itself can read at about 30 MB/sec so I wasn't expecting too much here. The result was that I can write to the harddrive at 19 MB/sec, to an unencrpyted loopback file on the harddrive at 19 MB/sec and to an encrypted loopback file on the harddrive at 11 MB/sec. It's clear that Padlock works best over a network.

    I think the summary here is that VIA did a great job on Padlock and saddled it with a pathetic CPU.



    AES-NI rocks but equal results can be had by throwing a lot of horsepower at it. Soon I'll be working on an Intel Hexacore with AES-NI and will be excited to see what kind of numbers I can get out of it. I also think that AMD has no other choice but to jump on the AES bandwagon because Intel is killing them. The AES decrypt speed on Intels Hexacore has been clocked at over 3 GB/sec. I'll be benchmarking one later in the summer.

    I'd be interested in playing with the new VIA's new 1.4 Ghz quad core Isaiah chips with Padlock in them. As  a general purpose CPU it's posting faster numbers than AMD's new Brazos CPU and I'd bet the AES performance on it is heads above any of the other CPUs.  Maybe my mini-ITX router board will get replaced in the near future...


  • I thought that is why we had Myspace!


    Readwriteweb did an article on Facebook wanting to be your one login. Their point was that people use it for posting their photos, instant messaging, "email" and just about everything else. The problem was the article's title was Facebook Wants to Be Your One True Login and of course Google indexes this with the words Facebook and Login together. Now when people type in "Facebook login" into Google they got the article referenced above instead of the Facebook login page. This would not be a problem for anyone with more than a half a working brain because they'd immediately notice that the Readwriteweb site looks nothing like Facebook and would then conclude that they were not in fact at the Facebook login page but a completely different page (hence the strange non-Facebook URL)! Unfortunately not everyone on Facebook has half a working brain (thanks Myspace for falling out of favor, now they invaded Facebook) so the comment thread that ensued was quite hilarious.

    Here are a few comments to the article. Notice that these freaks of nature really think they've landed on the Facebook login page but can't figure out how to log in.

    I did NOT hand pick these, I'm just going down the line one after the other!!!

    • ok cool now can I get to facebook
    • The new facebook sucks> NOW LET ME IN.
    • when can we log in?
    • just want to get on facebook
    • please give me back the old facebook login this is crazy.................
    • I just want to sign in............
    • I just want to log in to Facebook - what with the red color and all? LOLLLOLOL!!!!!111
    • wtf is this bullshttttttttttt all about. can i get n plzzzzzzzzz
    • What is going on? You are totally confusing me. Knock-knock. Anybody there? Let me in. Katherine
    • All I want to do is log in, this sucks!!!!!!!!!!!!!!!!!1
    • This is such a mess I can't do a thing on my facebook .The changes you have made are ridiculous,I can't even login!!!!!I am very upset!!!

    Keep in mind that these fine people are not on the FACEBOOK site at all but are on the Readwriteweb site reading an article about Facebook. There's more...

    • Can we log into face book? This is crazy I want to get all my info off and be done with this. I recently moved from MN to SC Myrtle Beach and facebook was a great way to keep in touch with family and friends but this is getting to be to difficult.
    • i need the old facebook this new one is very bad bbbbbbbbbbuuuuuuuuuuuuuuuuuuuu!
    • What have they done now. It's not simple enough for me to figure out.
    • Seams like all of the comets i read agree with me you people messed up royal i was enjoying facebook now i am thinking of getting rid of it all
    • Quit this crap and let me sign in!

    • this sucksssss how do i get on my screen?
    • Looking good
    • bring me back old facebook
      this is sheet


    It isn't until about the 80th post that a few people start realizing that this isn't Facebook. Here's the original URL if you want a laugh.

    Facebook wants to be your one true login


  • I'll take two fuzzy power adapters for $4 Alex

    I'm thinking that Amazon has an issue with their database and the photo isn't matching up exactly to the description.


  • I've always wanted to do tech support calls (but would get fired).

    I was digging through an old forum (OK I admit it, I googled myself!) and found a funny comic. I have always wondered how long I'd last on level 1 tech support - probably not long.


  • iphone users get laid more

    We all know that Android is a cooler geek OS than iphoneOS and let's not even mention Windows CE which is plain crap. However, the question may come up with who's getting the ladies - iphone users or Android users? Maybe a robot doesn't come to mind when women think of romance and love but still. Recently the popular online dating site OKCupid did the thing they're most famous for - analyze data and find patterns. The following picture is a result of that research.

    It appears that mindless drones get laid more than businessmen or tech savvy geeks. Who knew?

    I also find it interesting that 20% more women using iphones are getting laid then men who use iphones. Who are they waking up next to then I might ask? I'm not saying anything about iphone users but the statistics don't lie - they might be stuck on one cellular network but they appear to be fairly open with other choices in life. ;-)

    If the original study interests you (it should) head on over to OKCupid and check it out.



  • New Linux Router

    As some of you know I moved this year to a new house. I now have plenty of room in the garage for the servers which means my heating bill will go up now that they won't be contributing. Frown

    Anyway I'd been using Powerline networking for some time and it's worked wonderfully because you never need drivers for the network. How it works is you plug your network cable into a powerline bridge and then plug the bridge into the electrical wall socket. Do this for each location and you have an instant network! It's completely painless. Only problem is your electrical wiring needs to be perfect and mine to the garage in the new place isn't. My print speeds were so horrible that I was copying data to my laptop and carrying it down there to print. It doesn't take a genius to figure out that isn't the solution. I've always shied away from wireless outside of occasional use on the road because of the security implementations but it appears I have no choice short of rewiring my house.

    The new 802.11n stuff is tempting but without more testing I'm not going to bite. I already have a Linux powered Linksys WRT-54g which has served me well. My plan was not to add wireless cards to all the machines in the garage but rather set up a wireless bridge and plug a Gig switch into it so the servers could talk to each other at 1000Gbits and the rest of the world at 54Mbits. My biggest requirementis the router has to support the Linux DD-WRT software. After some looking I settled on the Buffalo WHR-G125  available for $29 at Circuit City with rebate...

    The Buffalo WHR-G125 does not come with Linux installed and from what I saw on the review forums doesn't come with much functionality in the stock firmware either. I honestly didn't even log into the stock firmware or use it in it's stock form. The first time it was ever powered on I nailed it with a tftp upload with new Linux DD-WRT firmware and it's been running Linux ever since.

    The Buffalo WRT-G125 is a 240 mhz mips processor (Broadcom BCM5354) embedded device with a 5 port switch and uplink. It has 16 megs of ram and with Linux running there's about 14 free. The antennae is fixed but I found one guy solder a connection on so he could connect any external antennae.

    If you don't know what dd-wrt is you're in for a treat. It's a replacement firmware operating system for many consumer based routers. It gained it's fame on the Linksys WRT-54 series and that's where I came into contact with it. The Linksys WRT-54g was a Linux router and several firmware replacement projects stemmed from it. I started using a paid for replacement called Talisman. The firmware was encoded and I lost the original file once and didn't want to go through the hassle of getting the author to give me another so I decided to look around and see what else was out there. Well, that and there was a lot of controversy about the developer's practice of stealing other people's code and then acting like a copywrite Nazi when anyone else wanted his code. I don't like supporting people like that so I switched to dd-wrt. DD-WRT adds many features to your router like ssh access, QOS, wireless bridging etc.. There really isn't any reason that I can think of for not using it.

  • Relaxen und watchen das blinkenlights!

    A friend and I were googling my name to find the oldest reference still on the Internet. Things seem to disappear after a while and it appears that I've been erased before 1997 but the positive outcome from this exercise was to find a spoof of an old newsletter I contributed to. In that newsletter was a quasi-german warning message which I've remembered but missed. With a tear in my eye I share it with you now. If you speak German, pretend you don't or you may miss the message.





      Alles Touristen und non-Technischen Look ens Peepers!

    Das computenmachine is nicht fur gerfinger poken und mittengrabben. Oderwise ist easy schnappen der springenwerk, blowenfusen, und poppencorken mit spitzensparken. Der Machine is diggen by experten only. Ist nicht fur gewerken by das dummkopfen. Das rubbernecken sightseeren keepen das cottenpicken hands in das pockets, so relaxen und watchen das blinkenlights!


  • Thomas Jefferson's view on Intellectual Property Rights

    I just ran across this quote of possibly this country's smartest founding father - Thomas Jefferson. It concerns copy writes and patents.

    If nature has made any one thing less susceptible than all others of exclusive property, it is the action of the thinking power called an idea, which an individual may exclusively possess as long as he keeps it to himself; but the moment it is divulged, it forces itself into the possession of every one, and the receiver cannot dispossess himself of it. Its peculiar character, too, is that no one possesses the less, because every other possesses the whole of it. He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.

    That ideas should freely spread from one to another over the globe, for the moral and mutual instruction of man, and improvement of his condition, seems to have been peculiarly and benevolently designed by nature, when she made them, like fire, expansible over all space, without lessening their density in any point, and like the air in which we breathe, move, and have our physical being, incapable of confinement or exclusive appropriation. Inventions then cannot, in nature, be a subject of property.

    Interestingly he believed that as soon as you released an idea of your own it belongs to everyone. Much in the way the GPL lays it down.

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