I didn't have time tonight to get tests on all the kernels under load, but here are the results, relatively load free.
I need to write a short python program to put the systems under duress. Hopefully I'll have time tommorrow to work on it and I can have the rest of the results in. PS:I'm attaching some results from an RT kernel on a debian system below that they used while the box was recieving flood ping from an external source and repeated loops of hackbench 25 and ls -Ral /. # cyclictest -a -t -n -p99 -i100 -d50 560.44 586.11 606.12 211/1160 3727 T: 0 (18617) P:99 I:100 C:1011846111 Min: 2 Act: 4 Avg: 5 Max: 39 T: 1 (18618) P:98 I:150 C: 708641019 Min: 2 Act: 5 Avg: 11 Max: 57 On Thu, Feb 16, 2012 at 10:37 AM, Fernando Lopez-Lezcano < [email protected]> wrote: > On 02/16/2012 04:33 AM, David Timms wrote: > >> On 15/02/12 16:49, Brian Monroe wrote: >> >>> On Tue, Feb 14, 2012 at 12:21 PM, Brendan Jones >>> <[email protected]>**wrote: >>> >>>> Latency times are really relative things based on many factors. Have you >>>> been getting better latency times than ta >>>> >>>> yeah. >>> >> >> I would be good to see real numbers associated with claims like the >> above; also how it is measured.. >> > > Cyclictest is widely used for measuring latencies: > > https://rt.wiki.kernel.org/**articles/c/y/c/Cyclictest.html<https://rt.wiki.kernel.org/articles/c/y/c/Cyclictest.html> > > > Also, indicate those various kernel patches and or options they use or >> have tested. >> > > The rt patches for the latest kernels (3.2 at this point) are here: > > http://www.kernel.org/pub/**linux/kernel/projects/rt/3.2/<http://www.kernel.org/pub/linux/kernel/projects/rt/3.2/> > > This is pretty much all I add to the rt patched kernels for Fedora (with > the proper configuration options, of course, I'm attaching the extra > options I'm currently using). To get the best performance in the Jack world > you need to tune the irq kernel thread priorities, that is usually done > using rtirq > (http://www.rncbc.org/jack/#**rtirq<http://www.rncbc.org/jack/#rtirq>), > and of course jackd should run with the proper rt priority as well. > > -- Fernando > > _______________________________________________ > music mailing list > [email protected] > https://admin.fedoraproject.org/mailman/listinfo/music >
latency
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