Messages in this thread | | | From | Benno Senoner <> | Subject | Low-latency patches working GREAT (<2.9ms audio latency), see testresults ,but ISDN troubles | Date | Sat, 28 Aug 1999 22:40:57 +0200 |
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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@gardena.net Linux scheduling latency benchmarks http://www.gardena.net/benno/linux/audio
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