Subject: Re: [linux-audio-dev] terrible latencytest results.. why??
From: Roger Larsson (roger.larsson_AT_norran.net)
Date: Fri Nov 09 2001 - 02:23:12 EET
On Thursday 08 November 2001 16:31, you wrote:
> Not understanding why I could not get alsa-lib/test/latency.c to work
> well, I decided to run Benno's latency test. It has been a long time
> since I did... The results are surprising, and nothing like the excellent
> results I have seen posted here.
>
They are not bad either... (sub 10 ms)
> $ ./do_tests none 3 128 0 256
>
> http://193.145.55.36/latencytest/
>
> (yes, I use a very small size for the disk tests, but even then!)
>
> Something is definitely very wrong here. I am running kernel
> 2.4.13 patched with preempt-kernel-rml-2.4.13-2.patch
And you have enabled it in .config? (checking the obvious...)
But wait... an AMD....
They have some 3DNow specific kernel optimizations that causes trouble -
they need to disable preemtion (uses fp registers...)
>
> Maarten
/RogerL
-- Roger Larsson Skellefteċ Sweden
This archive was generated by hypermail 2b28 : Fri Nov 09 2001 - 02:23:30 EET