[THIN] Re: PS4.0 session freezes

  • From: Matt Kosht <matt.kosht@xxxxxxxxx>
  • To: thin@xxxxxxxxxxxxx
  • Date: Fri, 14 Jan 2011 12:36:33 -0500

After much delay it was discovered that Client Side Preferences (CSP)
 history had reached such a size as to impact performance in a large way.
Issue was isolated to winlogon.exe take 1 core or more to 100% util.  MS had
us apply http://support.microsoft.com/kb/974266 which didn't seem to fix the
issue (moves CSP processing to background vs. foreground). Further digging
found that winlogon.exe was very busy enumerating C:\Documents and
Settings\All Users\Application Data\Microsoft\Group Policy\History\ folder
contents.  Affected servers had 5,000 to 6,000 folders and 2,000 to 3,000
files that got accessed everytime a refresh happened.  Simply renaming the
history folder forced it to rebuild to less than 200 files and 500 folders.
This resolved the issue and from posts I have seen cleaning up this folder
on a schedule is the long term fix to this as it will only balloon again
over time.

On Mon, Dec 13, 2010 at 4:23 PM, Matt Kosht <matt.kosht@xxxxxxxxx> wrote:

> Yes quite certain. Especially when you consider I get the issue with a LAN
> attached client.
> I did run across this KB http://support.microsoft.com/kb/324446 and I did
> confirm I can get the issue in RDP as well as ICA sessions.  The term
> servers use a file server to store redirected My Docs, roaming profiles, and
> Desktop. The issue was noticed after we added redirected Desktops. My
> unproven hunch is our file server is what is causing the freeze ups and
> hopefully making the lanmanserver changes recommended in the KB article on
> our term and file servers resolve the issue.
> On Mon, Dec 13, 2010 at 3:14 PM, Pat Coughlin <strangedog@xxxxxxxxx>wrote:
>> Almost sounds like a network problem.  Do you have enough bandwidth to
>> support both the user traffic and what the applications are consuming?
>> Pat Coughlin
>> Citrix Goon
>> On 12/13/10, Matt Kosht <matt.kosht@xxxxxxxxx> wrote:
>> > I have an older farm that under load will exhibit an issue of the Citrix
>> ICA
>> > session not accepting input and not changing the display save for the
>> mouse
>> > moving. This seems to happen on different servers (physical and virtual
>> > ones), LAN or WAN attached clients, and doesn't seem to be related to
>> the
>> > performance of the Citrix server itself (disk/cpu/net seem fine from
>> perf
>> > metrics) I look at).  There are no events in the event log that give me
>> much
>> > to go on either. Any suggestions on where to look for a root cause to
>> this
>> > issue?
>> > -Matt
>> >
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