[Bug 12641] kernel 2.6.12 performance problem

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Ubuntu | linux


p92 at free.fr changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major




------- Additional Comments From p92 at free.fr  2005-09-04 17:31 UTC -------
New tests and notices :

With breezy kernel Linux version 2.6.12-8-686 : same bad performance problems !
As soon as an application takes the CPU to 100% long enough, all other
applications will be impacted. They will each take up to 10% cpu each !
The CPU will never return to a reasonnable idle state (less than 1% total).


To be sure this IS NOT a hardware problem, I worked all the afternoon with a
Suze LiveCD on this box and let programs take 100% CPU while surfing. I had
OBSOLOTLY NO PERFORMANCE PROBLEMS. The Suze Live cd used a 2.6.8-24 kernel version.
 
With hoary  kernel Linux version 2.6.10-5-686 (buildd at vernadsky) (gcc version
3.3.5 (Debian 1:3.3.5-8ubuntu2)) #1 Fri Jun 24 17:33:34 UTC 2005
I can compile kde kopete (high cpu load) WITHOUT beeing impacted on my other KDE
applications.
I have also a perf problem with this kernel but it takes a very longer time to
develop and sometimes it does not appear at all.

with kernels > 2.6.10 the perf problem appears, AT WILL, I can trigger it simply
by using the CPU at 100% for some minutes.

For me this is a SHOWSTOPPER for breezy.

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