[prev in list] [next in list] [prev in thread] [next in thread] 

List:       kde-devel
Subject:    Re: Off List Message - KDE 3.0 Problem
From:       Manuel Amador <amadorm () usm ! edu ! ec>
Date:       2002-11-20 16:00:42
[Download RAW message or body]

Well, it really seems an issue with the kernel. If the kernel is issuing
those messages to syslog, you definitely hit a limit.  Note that it
doesn't say anything about KDE.

KDE 3 does start more processes/threads than KDE 2.

From Kernel Cousin:
the new library is based on an 1-on-1 model. Earlier design documents
stated that an M-on-N implementation was necessary to support a scalable
thread library. This was especially true for the IA-32 and x86-64
platforms since the ABI with respect to threads forces the use of
segment registers and the only way to use those registers was with the
Local Descriptor Table (LDT) data structure of the processor.  The
kernel limitations the earlier designs were based on have been
eliminated as part of this project.

So LDTs are Local Descriptor Tables.  You're running out of LDTs.  I
couldn't find any information on increasing any value (try max threads
with PowerTweak) that will let you scale further.

Or try one of the devel kernels (or maybe not =) )

luck,

   Rudd-O


El mar, 19-11-2002 a las 15:44, Dave Richards escribió:
> Hello-
> 	The City of Largo is a big KDE shop, as many of you are aware we run
> about 800 unique users, on 450 thin clients running the KDE desktop.
> 
> 	We upgraded from RedHat 7.2 to RedHat 7.3 and therefore from KDE 2.x to
> KDE 3.x.  There seems to be a scaling problem that was introduced in KDE
> 3.x that we cannot resolve.  Previously a Dual 933Mhz system would
> easily run 200+ users at once, but now the KDE 3.x runs out of resources
> around 91 users.  We have been told that it's related to the maximum
> number of threads allowed in the 2.4 kernel itself and is not something
> that can be fixed.  When we get to the 91st person, we started getting
> this message-->
> 
> Nov 19 14:09:41 desktop_a kernel: ldt allocation failed
> 
> We get this error over and over again and no additional users can log
> into the server.
> 
> I know that KDE 3.x is a wonderful environment and runs faster, but this
> issue has forcing us to consider reverting backwards until either KDE or
> the kernel issue is worked out and will scale better.
> 
> I'm not on the kde-devel list, but if anyone has insight into this
> issue, please drop me a line.  If you know a way to fix this in the 2.4
> kernel too, or can verify that we have to wait for 2.5/2.6 we need to
> know that too.
> 
> Thanks as always for your help
> Dave Richards
> City of Largo, FL
> Systems Administrator.
> -- 
> Dave Richards <drichard@largo.com>
> 
>  
> >> Visit http://mail.kde.org/mailman/listinfo/kde-devel#unsub to unsubscribe <<



>> Visit http://mail.kde.org/mailman/listinfo/kde-devel#unsub to unsubscribe <<
[prev in list] [next in list] [prev in thread] [next in thread]