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Bug#495529: marked as done (linux-source: SMP process scheduler leaves CPUs idle)

Your message dated Thu, 26 Nov 2009 23:10:21 +0100
with message-id <20091126221021.GA7854@galadriel.inutil.org>
and subject line Re: linux-source: SMP process scheduler leaves CPUs idle
has caused the Debian Bug report #495529,
regarding linux-source: SMP process scheduler leaves CPUs idle
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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immediately.)


-- 
495529: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=495529
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: linux-source
Version: 2.6.18.dfsg.1-18etch6
Severity: normal


I have some machines with 8 CPUs (dual Intel Xeon quad-core CPU chips),
used for long-running calculations; normally there are no short-lived
processes. If all processes are "niced" to the same or nearby level,
then things behave as expected. But if there is a large difference in
the "nice" level (e.g. one job at level 15 and 8 jobs at level 18), then
one CPU is left idle: total CPU percentages adding to 700% and "top"
shows idleness at 12.5%. (Under some similar conditions I have also
observed 2 idle CPUs.)

Please let me know if you need further details.

Thanks,

Paul Szabo   psz@maths.usyd.edu.au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia


-- System Information:
Debian Release: 4.0
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-pk02.19-svr
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)

--- End Message ---
--- Begin Message --- 
Version: 2.6.26-1

On Fri, Nov 20, 2009 at 06:40:59AM +1100, psz@maths.usyd.edu.au wrote:
> Having updated some machines to lenny and 2.6.26-19lenny2 kernel,
> I now cannot reproduce the problem: seems to be fixed.
> 
> I guess this bug may be closed.

Thanks, marking as closed.

Cheers,
        Moritz

--- End Message ---
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