[linux-audio-dev] Fwd: Low-latency patches working GREAT (<2.9ms audio latency), see testresults ,but ISDN troubles

New Message Reply About this list Date view Thread view Subject view Author view Other groups

Subject: [linux-audio-dev] Fwd: Low-latency patches working GREAT (<2.9ms audio latency), see testresults ,but ISDN troubles
From: David Olofson (audiality_AT_swipnet.se)
Date: la elo    28 1999 - 16:01:14 EDT


Benno Senoner's latest post to various lists... :-)

//David

---------- Forwarded Message ----------
Subject: Low-latency patches working GREAT (<2.9ms audio latency), see testresults ,but ISDN troubles
Date: Sat, 28 Aug 1999 22:40:57 +0200
From: Benno Senoner <sbenno_AT_gardena.net>

Hi,

I benchmarked Mingo's latest low-latency patches (2.2.10-N6 a bit modified)

The patches give me excellent results with sporadic very 2.9ms peaks !

See the testresults here:
http://www.gardena.net/benno/linux/audio/2.2.10-n6b/index.html

You can get the patch here:
http://www.gardena.net/benno/linux/audio/patches/lowlatency-2.2.10-N6B.patch

More details on my audio page.

Unfortunately the patch has still some problems , not latency-related:

- The ISDN hisax driver (my card is a Fritz classic) crashes the kernel at
modprobe hisax.o
(does not happen on an unpatched 2.2.10 kernel)
Can someone of the ISDN maintainers please reproduce/fix this ?
(maybe a race at module initialization ?)

- The disk performance decreases by 10-25% when I increase the CPU load in
the "latencytest" bench.
(On light CPU load there are no disk performance differences,
maybe this is related to higher scheduling overhead)

I think most of us want to have these "low-latency" features in the upcoming
2.4 kernel since it will make Linux a very good _MULTIMEDIA_OS_.

With Mingo's patches the Linux low-latency performance comes very close
to BEOS, and is much much better (3-4 times) Windows on the same hardware.
It's now time to stress audio-software vendors to port their cool apps to Linux.

comments ?

PS: To Microsoft's Anti-Linux team: just download the patch and compare the
performance with your crappy DirectX API :-)

regards,
Benno.

--
Benno Senoner
E-Mail: sbenno_AT_gardena.net
Linux scheduling latency benchmarks
http://www.gardena.net/benno/linux/audio

·A·U·D·I·A·L·I·T·Y· P r o f e s s i o n a l L i n u x A u d i o - - ------------------------------------------------------------- - - ·Rock Solid David Olofson: ·Low Latency www.angelfire.com/or/audiality ·Audio Hacker ·Plug-Ins audiality_AT_swipnet.se ·Linux Advocate ·Open Source ·Singer/Composer


New Message Reply About this list Date view Thread view Subject view Author view Other groups

This archive was generated by hypermail 2b28 : pe maalis 10 2000 - 07:25:53 EST