[linux-audio-dev] Re: more bad low latency results

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Subject: [linux-audio-dev] Re: more bad low latency results
From: Takashi Iwai (tiwai_AT_suse.de)
Date: Thu Nov 15 2001 - 14:12:54 EET

Hi,

At Thu, 15 Nov 2001 12:35:16 +0100,
Maarten de Boer wrote:
>
> Takashi Iwai <tiwai_AT_suse.de> wrote:
> > Hmm, I'm using an Athlon 600 MHz and got promising results even with
> > it. You can find the results (on different conditions) under
> > http://alsa-project.org/~iwai/latency-results/2.4.12
> > The result with all LL-patches is found in ll-all directory.
>
> Yes, that really looks good.
> What do you man with "all" LL-patches?

Since some part of Andrew's patch were rejected, I applied them by
myself, and additionally patched as mentioned in the previous mail.

> And what do you mean with VM-tuned? Where can I find information
> about that?
 
There are VM tuning parameters in /proc/sys/vm/vm_*_ratio files.
Lowering these values tend to bring better latency results.

> > The kernel was based on SuSE's 2.4.12, which is mostly equivalent with
> > AA-patch.
>
> What is the AA-patch? Andrew Mortons' ?
 
Andrea Arcangeli's patchset. Found at ftp.kernel.org/people/andrea.

The kernel I've tested can be found at
        ftp://ftp.suse.com/pub/people/mantel/next/linux-2.4.13.SuSE-5.tar.bz2
and LL patches for it
        ftp://ftp.suse.com/pub/people/tiwai/suse-patches/2.4.13-suse-ll.dif.bz2

A newer version kernel is avialble at
        ftp://ftp.suse.com/pub/people/ro/next/linux-2.4.14-SuSE-2.tar.bz2
although I have not tested this yet and am not sure LL patch above can
be applied.

> > FS is reiserfs. Compiled with ARCH_M586.
>
> do you mean the kernel configuration,
> CONFIG_M586=y
> ?
 
Oh, yes :)

> What soundcard do you use?

SB Live.

Takashi

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