Re: [linux-audio-dev] XRuns and Low-Latency

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Subject: Re: [linux-audio-dev] XRuns and Low-Latency
From: Frank Neumann (Frank.Neumann_AT_st.com)
Date: Mon Aug 06 2001 - 16:27:12 EEST

Hi,
rene.rebe_AT_gmx.net wrote:

> I have a problem during 10 channel, full-duplex IO using ALSA 0.9-beta6 and a Midimann Delta 1010. (Linux 2.4.7-low-latency, AMD Athlon 600Mhz, 256MB RAM)
>

[..]

> I works pretty well, except after 20-30 seconds I get many XRuns every 1 - 2 seconds. They happen >everytime Linux decides to flush the data in the disc-cache. (I have a IBM 30gig IDE disk (yes in UDMA66 >mode ...) with an ReiserFS on it.)

I can imagine your problem is that either:
- the LowLatency patches might not yet include lowlatencyfying (;^)
ReiserFS (tried ext2?)
- You don't actually have the LL stuff activated. If you built your
kernel with the option "Control low latency with sysctl.", you'll have
to say something like this as root:
# echo 1 >/proc/sys/kernel/lowlatency

because by default in this case LL would be disabled.

(all unconfirmed, just reading through Andrew Morton's page, CMIIW (*)).

Frank

(*) Correct Me If I'm Wrong 

-- 
      Frank Neumann (Frank.Neumann_AT_st.com), VIONA Development Center
            ST Microelectronics, Karlstraße 27, 76133 Karlsruhe

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