[linux-audio-dev] Re: Voluntary Kernel Preemption Patch

[Con Kolivas]

Andrew Morton writes:

> Paul Davis <paul at linuxaudiosystems.com> wrote:
>>
>> >resierfs: yes, it's a problem.  I "fixed" it multiple times in 2.4, but the
>> >fixes ended up breaking the fs in subtle ways and I eventually gave up.
>> 
>> andrew, this is really helpful. should we conclude that until some
>> announcement from reiser that they have addressed this, the reiserfs
>> should be avoided on low latency systems?
>> 
> 
> It seems that way, yes.  I do not know how common the holdoffs are in real
> life.  It would be interesting if there was a user report that switching
> from reiserfs to ext2/ext3 actually made a difference - this would tell us
> that it is indeed a real-world problem.
> 
> Note that this info because available because someone set
> /proc/asound/*/*/xrun_debug.  We need more people doing that

Can I just point out that the reiserfs3.6 delays that I originally reported 
with the preempt threshhold test did not come up once the patch was fixed. I 
have my preempt threshold set at 1ms and did not see one single reiserfs 
dump in my syslog. ie I don't think I am personally seeing any significant 
reiserfs3.6 latencies.

Cheers,
Con

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: not available
URL: <http://lists.linuxaudio.org/pipermail/linux-audio-dev/attachments/20040713/99f39344/attachment.pgp>