[cod] Linux beta server problems

[Steven Hartland]

You seem to have your self confused about dual cores there.
Also all AMD MB's support HyperTransport as its the core
interface. To what extent its used to NUMA / interlacing does
vary however but most OS's aren't NUMA aware so it does little
or no good.

Our mainstay server is a dual 275's which present 4 * 2.2Ghz
AMD 64 processors enabling them to run a serious about of
servers e.g. 4 * 64 player BF2 servers.

    Steve / K
  ----- Original Message ----- 
  From: Mark J. DeFilippis 
  To: cod at icculus.org 
  Sent: Sunday, October 30, 2005 12:41 AM
  Subject: Re: [cod] Linux beta server problems


  Yes, Sorry. I was rushing for dinner, and thanks for making the corrections.

  Indeed, the Tyans are of course are a HyperTrasport MOBO. The CPU's are Dual Core Opterons,
  hence 8 CPU's, and do not support HyperThreading as you correctly stated.
  (Although this would make the Opteron a bit more practical for the client side if it did, as dual core
  don't do much for the client side as you know. This shows up as 8 CPU's. (Not to mention that the
  client side application would have to support the dual core processor and I don't see that happening
  any time soon, which is not to say it won't.

  The DUal Intel P4 is HypterThreading, and the Intel based MOBO's do not support HyperTransport
  as you correctly point out. This of course, as you pointed out shows up as 4 CPU's, 2 which are of
  course real, the other two are virtual. :)

  However, I will say this much for the 3.2 P4 Xeon HyperThread procs, using 2.4 with 2.6SMP yields
  much better results in processor thread scheduling than it did on 2.3 with the SMP kernel.
  So nice gain on the same hardware by just upgrading from 2.3 to 2.4 with 2.6SMP... If anyone
  is running this out there and 2.4 with 2.6SMP is an option, go for it. You WILL notice.

  As much as I admit the Tyan HyperTransport motherboard with Dual Opteron's is a
  powerhouse, it is not my private gaming machine for me and my boys ;-)  It is a
  work machine, (but I have fun stuff running on it, and I won't give it back ever) :)

  I widely use it to do Queuing, modeling, and modeling of stochastic processes I
  am a high speed transport network architect by trade.  This chews up tons of CPU.
  Some of the models with data collected would run several days if it were not for this puppy.
  But when it is not doing work, it is all mine. :)

  (As a side note, honestly the logical CPU of the HyperTransport board based Opteron does
  not yield the same performance as the primary processor. So although real
  and logical, it at times behaves virtual.  Where if I had 8 real processors in a
  grid, I could truly schedule processes in multiple ways to the processors. Don't
  get the ability with the Dual core Opterons.

  Thanks for the corrections.

  Mark


  At 05:59 PM 10/29/2005, you wrote:


    I think you're mistaken, as this is a HyperTransport board, not Hyperthreading (hyperthreading is an Intel technology, HyperTransport is an AMD technology.. and they are very different techs at that). They aren't virtual cpus, but logical cpus.

    Intel P4/Xeons use Hyperthreading (which show up as logical cpus as well).
    Opteron based boards are HyperTransport, and dont support Hyperthreading.

    It sounds like you have 4 dual core processors (so you have a total of 8 Logical, but very real processors). Very nice rig.. Wish it were mine :)

    A Quad Dual Core Xeon would show up w/ 16 logical processors (8 very real processors and 8 very virtual hyperthreading units).

    Just don't want anyone getting confused!
  S1,-------------------------------------------------------------------------------
  Mark J. DeFilippis, Ph. D EE          defilm at acm.org
                                        defilm at ieee.org





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