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List:       kde-devel
Subject:    Re: Off List Message - KDE 3.0 Problem
From:       Jesse Barnes <jbarnes () sgi ! com>
Date:       2002-11-20 17:57:00
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Sounds like this problem is fixed in recent 2.4-ac kernels.  Not sure
how easy it is for you to try one of those though...

Jesse

On Wed, Nov 20, 2002 at 11:40:57AM -0500, Manuel Amador wrote:
> 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 <<
 
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