On Thu, Mar 23, 2006 at 09:14:39PM +0800, Wu Fengguang wrote:
> 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
Will try this as soon as I can get some net drivers working under
2.6.16 ...
-r
--
Rodney "meff" Gordon II -*- [email protected]
Systems Administrator / Coder Geek -*- Open yourself to OpenSource
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