wiki page (was: Re: [linux-audio-user] dipping toes in 2.6 waters)

Lee Revell rlrevell at
Mon Aug 9 20:03:12 EDT 2004

On Mon, 2004-08-09 at 19:23, Florin Andrei wrote:
> On Mon, 2004-08-09 at 13:48, Florian Schmidt wrote:
> > Hmm, in my case the maximum value i can use is 128, and i cannot see a
> > difference between 128 and 16 either. It didn't do harm.
> Maybe it vastly depends on the workload? You know, like writing a tiny
> 44.1/16/2 audio stream to disk versus writing a huge raw video stream
> (or a large database workload).
> What was your disk workload?

I tried every disk torture benchmark I could think of - bonnie++,
sysbench, dbench, iozone.  I also tried stressing the CPU/scheduler with
parallel builds and CPU stress tests.  Stressing the system increases
the average latency slightly (I have graphs at but does not affect
the worst case at all.  I am guessing whatever code path is involved in
the higher latencies is not filesystem-related.

The 128 vs 1024 default has to do with whether 48-bit addressing is
enabled.  This will be enabled for larger disks (120GB+?).  So, the size
of your disk affects the maximum amount of IO that can be in flight at
once.  This was covered in one of the recent lkml threads, check the


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