[THIN] Re: XenServer Slowdown

  • From: Dan Dill <DanD@xxxxxxxxxx>
  • To: "thin@xxxxxxxxxxxxx" <thin@xxxxxxxxxxxxx>
  • Date: Wed, 17 Nov 2010 10:04:48 -0800

In 2003 you could turn on logging and then get some good insight into exactly 
what's going on, apparently with 2008+ you have to bring in Microsoft to debug 
profile loading:


Dan Dill |Systems Engineer | Harsch Investment Properties
1121 SW Salmon St. | Portland, OR 97205 |*: 503.973.0206 | *: 

From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of 
James Scanlon
Sent: Wednesday, November 17, 2010 8:57 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: XenServer Slowdown

servers have 36GB of RAM physically.
Task manager shows 32GB of ram
HP SIM reports 31.9GB of ram available/addressable.....

From: James Scanlon
Sent: 17 November 2010 16:46
To: 'thin@xxxxxxxxxxxxx'
Subject: RE: [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 

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?


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

(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!



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