[linux-audio-user] Re: x86_64 RT performance, ingo patches

[Lee Revell]

On Fri, 2006-06-16 at 16:28 -0500, Gian Paolo Mureddu wrote:
> Lee Revell escribió:
> > I would recommend you attack one issue at a time.  But yes, that will
> > work.
> >
> > It might not even be the case anymore that reiser3 causes latency
> > problems - the -rt kernel and the introduction of the preemptible BKL
> > probably improved the situation.  It has been a long time since I tested
> > it.
> >
> > Lee
> >
> >
> >   
> Hmm... it might be interesting to have a test case of this...
> 

It should be trivial to make one.  The -rt kernel is of course
unaffected, as all filesystem operations are offloaded to IRQ threads
and softirqd.

For testing the mainline kernel, use 2.6.16 with this patch:

http://people.redhat.com/mingo/latency-tracing-patches/latency-tracing-v2.6.16.patch

Generate a lot of disk activity (dbench, tiobench, etc) and
check /proc/latency_trace for reiserfs related entries.

Lee