Messages in this thread | | | Date | Wed, 14 Mar 2007 19:31:03 -0700 | From | "Siddha, Suresh B" <> | Subject | Re: RSDL v0.30 cpu scheduler for mainline kernels |
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Con,
On Mon, Mar 12, 2007 at 10:58:11AM +1100, Con Kolivas wrote: > There are updated patches for 2.6.20, 2.6.20.2, 2.6.21-rc3 and 2.6.21-rc3-mm2 > to bring RSDL up to version 0.30 for download here:
I tried this on a Core 2 Quad cpu system(system has 4 cores on a single package). When I run SPECjbb2000 with number of threads varying from 1-8, I see ~4.5% perf regression with RSDL (compared to native 2.6.21-rc3) in the 8 threads case. This I think, is coming from increased number of context switches, when we have more than one thread(at same user priority) on the same logical cpu.
Just to see the % increase in number of context switches, I ran 8 infinite loops (simple while(1); 's) and with 2.6.21-rc3 I see ~70 context switches every second, whereas with RSDL I see ~530 context switches.
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