At Tue, 02 Oct 2001 19:33:45 +0200, I wrote:
>
> Hi,
>
> i'm trying to run latency test for ALSA9 (based on Benno's latency
> suite) on my kernel to measure the latency with preemption and LL
> kernel patches.
> however, the test program hangs up almost always in the middle during
> disk write tests of 500 MB.
> I first though that this is related with VM and happens when the
> memory becomes full. But it's not true. This happens even if there
> are enough memory left unused.
Short follow:
Ok, i found the problem. It's my fault.
I didn't implement error check from snd_pcm_writei().
Since the test program has high RT priority, once if an overrun
occurs, then it grabs the cpu in the infinte loop of snd_pcm_writei()
without initialized.
Now the fixed version was there, in the same place, as the same name:
http://www.alsa-project.org/~iwai/latencytest-0.42+alsa.tar.bz2
Please give a try!
ciao,
Takashi
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