From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lennart Poettering <mznyfn@0pointer.de>
Subject: Re: Timer instability
Date: Mon, 23 Feb 2009 20:20:45 +0100
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On Mon, 23.02.09 03:56, Lennart Poettering (mznyfn@0pointer.de) wrote:

> Hmm, for now my little testing experiment I've now found es1969,
> ens1371, intel8x0, snd-emu10k1 and some intel-hda to have unreliable
> _avail() or _delay().

And here's the output for HDA STAC92xx:

http://pastebin.mandriva.com/7149

The first dump is the interesting one: when audio starts to play the
buffer abruptly runs empty in just 20us after the device started. (The
rightmost column is the state btw, 3 == playing).

A quick overview of cards where _delay() and/or _avail() are unreliable:

 es1969
 ens1371
 intel8x0
 emu10k1
 intel-hda on STAC92xx
 intel-hda on AD1989B

Lennart

-- 
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net         ICQ# 11060553
http://0pointer.net/lennart/           GnuPG 0x1A015CC4