lkml.org 
[lkml]   [2003]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 2.4.21 on SMP has extra slow context switch
New informations. I tested more kernels.
2.4.21 and 22 with 2 CPUs are slow as hell. When I reboot
with maxcpus=1 then all is suddenly ok.
Also floppy drive was not detected in 2 CPU config while
with maxcpus=1 it is.
I placed lmbench data and dmesg output to
http://luxik.cdi.cz/~devik/tmp/slow-smp/ in case someone
knows what to do.
I can do some other tests if you want me to do them.

thanks,
devik

On Wed, 27 Aug 2003, devik wrote:

> Hello,
>
> I upgraded one SMP box (Soyo MB, 2x PII/350, 500MB) from
> 2.4.8 (really) to 2.4.21 last week. Users start to complaint
> that it is slow.
> I run lmbench's context switch measurer and it's result is:
> "size=0k ovr=5.41
> 2 169.26
> 3 111.28
> 4 83.99
>
> While on very similar UP system (the same CPU & kernel) it is:
> "size=0k ovr=3.50
> 2 1.80
> 3 2.08
> 4 2.89
>
> Have someone even idea what is going on ? The systems seems to be
> fairly stable but slooow.
> I plan to reboot with single CPU at evening and/or upgrade to .22,
> but the numbers above are weird.
>
> thanks,
> -------------------------------
> Martin Devera aka devik
> Linux kernel QoS/HTB maintainer
> http://luxik.cdi.cz/~devik/
>
>

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:48    [W:0.052 / U:1.920 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site