Messages in this thread | | | Date | Fri, 7 Jul 2000 19:00:26 -0400 (EDT) | From | Samuel S Chessman <> | Subject | Re: [linux-audio-dev] [PATCH++] latency-profiling for 2.4.0-test3-pre2k |
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I have been following the latency issue for some time now and I am happy to report great strides have been taken in improving latency in the Linux 2.4.0-test2-pre? series of patches.
Here is a snapshot of some results that show promise! I hope to repeat them on an SMP system soon.
Benno Senoner's (sbenno at gardena dot net) latencytest used for these charts: See http://www.gardena.net/benno/linux/audio/latencytest-0.42.tar.gz for the source.
http://www.tux.org/~chessman/bench/latencytest/ has preliminary results with charts showing the differences when hdparm unmaskirq and 32bit are toggled.
I varied the hdparm 16/32 bit I/O and interrupt unmasking, and got a non intuitive result, better results for 16 bit I/O, unmasking disabled. Tonight I will run the test with the other two cases and see if it correlates to one of them.
System under test is a Dell GX1 400MHz PII IDE disk, running linux-2.4.0-test2-pre5 mm/filemap.c patches from Andrew Morton dated Thu Jul 06 2000 - 23:21:48 EDT ALSA-driver 0.5.8b XFree86 Version 3.3.6 w/ Mach64, glx.o, agpart kernel module
All tests are showing greater than 99% +/- 2ms for the disk tests. The overruns appear to be mm related, Andrew's patch indicated sys_close() and sys_exit() still need attention.
This is getting close to usable for my purposes!
-- Sam Chessman "E Pluribus Linux" chessman@tux.org
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