Re: [linux-audio-dev] alsa latency statistics

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Subject: Re: [linux-audio-dev] alsa latency statistics
From: Josh Green (jgreen_AT_users.sourceforge.net)
Date: Thu Oct 25 2001 - 01:59:03 EEST

On Wed, 2001-10-24 at 09:15, Roger Larsson wrote:
> On Wednesday 24 October 2001 03:54, dave willis wrote:
> > - - -
> > latencytest was ran as follows:
> > ./latencytest -t alsa -d hw -q none 3 256
> > ./latencytest -t oss -q none 3 256
>
> Question is, what did you do while this did run?
> * Compile the kernel?
> * run x11perf?
> There are lots of testcases included in the latencytest package.
>
> The point with the patches are to give a better worst case!
> The normal case when nothing else is being run will not change.
> (latency as a term is difficult. The audio latency in this case is
> close to "buffer latency= 4.000 ms" - i.e. from generation to actual
> sending to soundcard, then add some time for output filters...)
>
> > - - -
>
> > used alsa-cvs from oct 20, oss = alsa's oss-emu
>
> Tests with standard oss would be interesting too...
>
> /RogerL
>
> --
> Roger Larsson
> Skellefteċ
> Sweden

Running ./do_tests will run latencytest and a handful of other tests to
load the system.

export LATTEST="./latencytest -ta -d hw:0,0"
./do_tests none 3 256 0 256000000

Is what I use (3 fragments of 256 bytes and a ~256MB file size for use
in disk copy, read and write tests). 

-- 
    Josh Green
    Smurf Sound Font Editor (http://smurf.sourceforge.net)

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