Re: [alsa-devel] [PATCH] ASoC: AM3517: Fix AIC23 suspend/resume hang

[Mark Brown <broonie@opensource.wolfsonmicro.com>]

On Thu, Nov 26, 2009 at 08:26:44PM +0530, Aggarwal, Anuj wrote:

> driver, although I am not sure if the problem is in the audio driver. 
> When tried to capture, using NFS as storage, it gives overrun error and comes out with:
> arecord: pcm_read:1617: read error: Input/output error

> It happen always after ~20 sec, file size ~5MB. Tried with multiple
> configurations in arecord but no use.
> When tried: arecord -f cd /dev/null, it works fine. Same issue doesn't 
> come too when I try to store the captured audio file on a MMC card.

> Any idea what could be the problem? Why arecord goes for a toss after a 
> single overrun error and why it is happening always after ~20 sec? Is
> there something which can be tried to narrow down the problem?

Sounds like you've narrowed the problem down to a performance issue with
NFS writeout - it's probably having trouble keeping up with your I/O
rate.  This isn't 100% surprising with smaller systems, sometimes tuning
the NFS configuration can resolve the issue but sometimes the hardware
is just underspecified.

arecord is a pretty basic program and doesn't try terribly hard to
recover from errors.