[THIN] Re: XenApp 5 - 2008 x64 Slow

  • From: Steve Snyder <kwajalein@xxxxxxxxx>
  • To: thin@xxxxxxxxxxxxx
  • Date: Thu, 6 Jan 2011 16:27:13 +0100

what CPUs? I had a similar issue with W2K3 x64 and the AMD Opteron - was a
boot.ini flag that cured it. Not sure is w2k8 has a similar issue/cure esp.
since it uses BCD

On Thu, Jan 6, 2011 at 4:10 PM, Andy Friar <Andy.Friar@xxxxxxxxxxx> wrote:

>  I’m have a problem with the following Windows 2008 SP2 Enterprise x64
>
> XenApp 5 Enterprise R01
>
>
>
> Boxes are Dell blade 8 core + HT  49Gb RAM
>
> Local manadatory profiles with full Appsense suite utilising EM +
> Personalisation service.
>
> Desktop / My Documents / Favourites redirected to a Netapp Filer running
> CIFS.
>
>
>
> The more users that come onto the box the slower the machine gets.
>
>
>
> @ 0-45 users the box is responsive, logon times are good but it still has
> this apparent lag when accessing local apps
>
> @ 50 the lag is getting worse sometimes freezes but always comes back.
>
> @ 60 logon times are substantial, just selecting a cell in excel can take
> 30+ seconds.
>
>
>
> Performance counters seem fine
>
>
>
> 14% processor time
>
> 25k context switches / sec no massive jumps
>
> 0 Processor queue length
>
> 99% disk idle
>
> 0 disk queue length
>
> 15-20k threads
>
> 0 Redirector\Current Commands
>
>
>
> The only large one is system calls / sec which can be anywhere from 80k to
> 1.5m, I’ve cut down the apps but system calls are still high.
>
>
>
> To me the server feels as if it has no cpu left, but given the resources
> free it looks more like an i/o problem, I’ve tuned the smb with the
> following
>
>
>
>
> [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Lanmanserver\Parameters]
>
> "MaxWorkItems"=dword:00002000
>
> "MaxMpxCt"=dword:00000800                                 (subsequently has
> been changed to match the Netapp)
>
> "MaxRawWorkItems"=dword:00000200
>
> "MaxFreeConnections"=dword:00000064
>
> "MinFreeConnections"=dword:00000020
>
>
>
>
> [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Lanmanworkstation\Parameters]
>
> "MaxCmds"=dword:00000800
>
>
>
> [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session
> Manager\Configuration Manager]
>
> "RegistryLazyFlushInterval"=dword:0000003C
>
>
>
>
>
> The NetApp filer has had cifs.max_mpx set to 1124 so I’ve subsequently
> changed the citrix servers to match this number rather than the 2048
> previously.
>
> It’s running around 30%cpu 2000 io/sec 98% cache hit.
>
>
>
> Any suggestions on where else I might look into what is causing the
> bottleneck?
>
>
>
> Thanks
>
>
>
> Andy
>
>
>

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