Re: [linux-audio-dev] low latency questions

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Subject: Re: [linux-audio-dev] low latency questions
From: ian (deviant_AT_custard.org)
Date: Mon Apr 28 2003 - 21:12:37 EEST


i've just been reading all about kernel stuff, as i've built a gentoo
system, and i'm now patching the (2.4.20) kernel up for the best audio
performance i can get. i'm sticking with 2.4.20 so that i have something
nice and stable. anyway, i discovered that the 2.5 series of kernels
already include the preemption patch. robert love, the maintainer of the
preemption stuff also has another patch up on his website called the lock
break patch. it is an addition to the preemption patch which works much
like andrew mortons patch, and is partly based on it. i don't think it
exists for the 2.5 series, but i think that i am going to use it instead
of the ll patch for my kernel, as it seems like it might work better in
conjunction with the preemption patch.
as for the nvidia drivers, i am using those too. i have no idea whether
there could be code in them that could not be preempted, but if you found
problems with them, you could always use the "nv" module instead of the
"nvidia" module. it's support for the nvidia cards is much more basic (but
looked the same as the "nvidia" module when i ran X), so maybe it might
work better with audio stuff. just a thought.
ian

On Mon, 28 Apr 2003, Maarten de Boer wrote:

> Hello,
>
> I have two low-latency questions:
>
> - How do 2.4.20 (LL+preempty) and 2.5.68 compare? Are there any patches
> for improving latency on 2.5.68?
>
> - NVidia drivers, being closed source, might contain long codepaths which
> are not patches by the LL patches. Does anybody have bad experiences with
> NVidia cards that confirm this, or do they seem to work correctly?
>
> Thanks.
>
> Maarten
>
>
>
>


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