[THIN] Re: XenServer Slowdown

  • From: Berny Stapleton <berny@xxxxxxxxxxxxxxxxx>
  • To: thin@xxxxxxxxxxxxx
  • Date: Wed, 17 Nov 2010 22:20:38 +0000

Don't forget the toss up between UDIMM vs RDIMM.

UDIMM is faster than RDIMM but not registered, there is a memory limit on
the amount of UDIMM you can run as well. Depending on the situation your in,
this might be a trade off your willing to make.

Berny



On Wed, Nov 17, 2010 at 9:05 PM, Joe Shonk <joe.shonk@xxxxxxxxx> wrote:

> 32 gigs is the limit for Windows Server Standard 2008 x64.  Enterprise will
> do 1 terabyte.
>
>
>
> The one thing that jumps out at me is the number 36.  Generally with a 2
> proc Nehalem based system you would expect to see memory in the following
> multiples: 1, 12, 24, 48 or 96.  Yes there are other memory configurations
> that work but they generally indicate that the memory is not optimized.
>
>
>
> The number 36 means to me that you’re running either (6 x 4gb dimms + 6 x
> 2gb dimms) or (18 x 2gb dimms).  The later configuration would choke your
> memory bus speed from 1333MHz to 800 MHz.
>
>
>
> I would also check to see what rank the dimms you have are.
>
>
>
> Joe
>
>
>
> *From:* thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] *On
> Behalf Of *James Scanlon
> *Sent:* Wednesday, November 17, 2010 9:46 AM
>
> *To:* thin@xxxxxxxxxxxxx
> *Subject:* [THIN] Re: XenServer Slowdown
>
>
>
> XenApp - Correct
>
> Windows 2008 SP2 - not R2,
>
> Windows system reports 36GB in system properties, HP SIM reports 32GB of
> ram addressable / available - WTF? - chasing this up for further
> details.......
>
>
>
> ------------------------------
>
> *From:* thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] *On
> Behalf Of *Joe Shonk
> *Sent:* 17 November 2010 16:28
> *To:* thin@xxxxxxxxxxxxx
> *Subject:* [THIN] Re: XenServer Slowdown
>
> I’m going to out on a limb and assume that you are referring to XenApp and
> not XenServer.
>
>
>
> First question, why Windows 2008 Standard x64?
>
>                 Windows 2008 R2 is going to be a much better choice,
> especially if you are running this directly on new hardware.
>
>                 Second, Standard edition only support 32 gigs and you’re
> showing 36 gigs
>
>
>
> Also, which metric is sitting at 25% utilized?
>
>
>
> Joe
>
>
>
> *From:* thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] *On
> Behalf Of *James Scanlon
> *Sent:* Wednesday, November 17, 2010 8:45 AM
> *To:* thin@xxxxxxxxxxxxx
> *Subject:* [THIN] Re: XenServer Slowdown
>
>
>
> Greetings
>
> (sorry about last unfinished email went to save to get more info and
> clicked send - sigh)
>
>
>
> We are having speed issues with our XenServers
>
>    - Brand New builds
>    - Deployed with Altiris
>    - Xenserver 5.0
>    - Windows 2008 Standard 64bit
>    - 36GB RAM
>    - Dual CPU, 8 Core processors X5560 2.80Ghz
>    - Appsense EM and PM (with citrix CPU and memory management disabled)
>    - Sophos AV
>    - HP Hardware DL380 G6 with teamed nics
>
> For normal operation we are getting 25 second login time (to desktop)
>
>
>
> After approx 30 users (or 2 days without a reboot), the performance drops
> to 1-1.5 minutes just to log in, everything sluggish, cant open task manager
> even though multiple taskman icons appear in systray.
>
> No performance issues on the systems themselves, all sitting around %25
> utilised. (CPU, MEM, DISK etc)
>
>
>
> So far:
>
> We have disabled Sophos, no result
>
> disabled Appsense, no result
>
> turned on VT instructions for CPU in the BIOS, no result
>
> turn off TCP offloading for the NICS
>
> HW firmware for Servers / patching (latest PSP)
> Software for OS and apps / patching
>
>
>
>
>
> Any one seen anything like this already? apart now from bringing up a VM
> host to eliminate hardware or a full manual rebuild and testing at each
> stage of the build process - we are starting to run out of 'obvious ideas'
>
> ANY assistance and advice greatly appreciated!
>
>
>
> JAMES
>
>
>
>
>
>
>
>
>
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