On 2002.07.09 rwhron@earthlink.net wrote:
>The -jam patchset is interesting because it starts out
>with the entire -aa patchset and adds a few things.
>
>Sometimes small differences in LMbench between -jam and -aa are
>just CPU bounces on SMP. The difference for pipe and af/unix latency
>only appears on SMP too, but it is very consistent. (My k6/2
>has small differences between -aa and -jam for pipe and af/unix
>latency).
>
>You will know better what could make the difference:
>
>This is the averages:
>
>*Local* Communication latencies in microseconds - smaller is better
>-------------------------------------------------------------------
>kernel Pipe AF/Unix
>----------------- ------- -------
>2.4.19-pre10-aa4 33.941 70.216
>2.4.19-pre10-jam2 7.877 16.699
>
Candidates in pre10-jam2 could be:
11-irqbalance-B1.bz2
12-smptimers-A0.bz2
13-irqrate-A1.bz2
excluding anything that has nothing to do with pipes or latency.
Could you try latest -rc1-aa2 ? It includes also irqbalance, so it could be
on varable less in the equation.
I dropped smptimers and irqrate because they did not mix very well with
bproc and O1 scheduler, but I can try to add them again.
I have a rc1-jam2 ready, but the only important change wrt SMP could be the
mem-barrier specific implementation for P3/P4, and your box is an AMD.
??
-- J.A. Magallon \ Software is like sex: It's better when it's free mailto:jamagallon@able.es \ -- Linus Torvalds, FSF T-shirt Linux werewolf 2.4.19-rc1-jam2, Mandrake Linux 8.3 (Cooker) for i586 gcc (GCC) 3.1.1 (Mandrake Linux 8.3 3.1.1-0.7mdk) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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