lkml.org 
[lkml]   [2006]   [Mar]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [ck] 2.6.16-ck1
Hi Rodney,

Thanks for your testing :)

On Thu, Mar 23, 2006 at 05:31:18AM -0600, Rodney Gordon II wrote:
> Adaptive readahead: I had probs with this before, and I still do.. On
> a desktop if you have odd problems (nothing responding for SECONDS,
> very slow disk I/O during heavy I/O, etc..) disable it.

Your problem on I/O latency with ara can be tracked down with the help
of Ingo's latency tracing patch. It goes like this:

1) download
http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.16.tar.bz2
http://www.vanheusden.com/ara/adaptive-readahead-11-2.6.16-rc6.patch.gz
http://people.redhat.com/mingo/latency-tracing-patches/latency-tracing-v2.6.16.patch

2)
tar jxf linux-2.6.16.tar.bz2
gunzip adaptive-readahead-11-2.6.16-rc6.patch.gz
cd linux-2.6.16
patch -p1 < ../adaptive-readahead-11-2.6.16-rc6.patch
patch -p1 < ../latency-tracing-v2.6.16.patch

3) compile kernel with Adaptive readahead support
4) boot with the new kernel, and run
echo 0 > /proc/sys/kernel/preempt_max_latency
5) feel some latency problems
6) report the content of /proc/latency_trace

Thanks,
Wu
-
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: 2006-03-23 14:09    [W:0.052 / U:2.604 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site