Subject: Re: [linux-audio-dev] Re: more bad low latency results
From: Luke Tindall (luke_AT_maths.ex.ac.uk)
Date: Wed Nov 14 2001 - 16:13:51 EET
On Wednesday 14 November 2001 12:20, you wrote:
> I made a webpage with the several tests I did. Please have a look
> at it. I ran tune_disk /dev/hda, and
>
> do_tests none 3 256 0 2048
> (indeed a really small size for the disk i/o test, but I was more
> interested in the rest)
>
> http://193.145.55.36/latencytest
>
> The soundcard I use is a Trident 4DWave NX, drivers are latest alsa .
>
> First of all, it is really strange that
> 2.4.10-NO-LL-386
> 2.4.10-LL-386
> are practically identical; it is as if the low latency patch is not
> working. Maybe I missed something here, but if cat
> /proc/sys/kernel/lowlatency gives me 1, I can be sure it is on, isn't it?
>
> The 2.4.14-LL-PIII test have bad disk results (ran with large size btw). No
> idea why. How do I solve that?
>
> The best results seem to be the 2.4.14-LL-386, but here the
> alsa-lib/test/latency gives me underruns,
> ./latency -r 44100 -m 512 -M 512 -t 1 -p
> XRUNs right away.
> ./latency -r 44100 -m 1024 -M 1024 -t 1 -p
> does work but - and this is very important - the sound get fucked up
> (dusty vinyl record effect). I can record this and make a soundfile
> available for download if anybody is interested.
>
> Maarten
Try setting the sample rate to 48000, my trident sounds crap at 44100
especially for recording, I've given up on 44100 and 48k is better. Are you
changing the settings for /proc/sys/vm/bdflush? I'm following you progress
closely as I have an athlon as well.
-- Luke Tindall
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