[THIN] Re: XenServer Slowdown

  • From: "James Scanlon" <James.Scanlon@xxxxxxxxxxxxxxxx>
  • To: <thin@xxxxxxxxxxxxx>
  • Date: Thu, 18 Nov 2010 16:04:40 -0000

as below.
probably doesnt paint a very clear picture im sorry
:) James


From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On
Behalf Of Landin, Mark
Sent: 18 November 2010 15:59
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: XenServer Slowdown

"After approx 30 users (or 2 days without a reboot), the performance


 Are you saying that once you hit 30 concurrent users, performance
drops? If so, does performance improve once you dip back down below 30?
NO (30 is approx , sometimes 32, or 36 or 30)


Or do you mean that after 30 sessions have been initiated since the last
reboot, performance drops, and stays that way, even if there's only 1
concurrent user?  YES 


Or, do you mean that, 2 days after a reboot, performance drops,
regardless of how many concurrent users are on, or how many sessions
have been initiated on that server since the last reboot?   


What happens if you boot a server, let it sit idle for 3 days, then let
a user on. Is the performance good or not?  In no users - no problem (so
far) - at least from a day of sitting idle...


I think those are important symptoms but I'm not clear exactly what your
situation is.



From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On
Behalf Of James Scanlon
Sent: Wednesday, November 17, 2010 9:45 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: XenServer Slowdown



(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
*       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

ANY assistance and advice greatly appreciated!









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