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SubjectRe: Nick's scheduler v17
On Sat, 25 Oct 2003 04:10:24 +1000
Nick Piggin <piggin@cyberone.com.au> wrote:

> Hi,
> http://www.kerneltrap.org/~npiggin/v17/
>
> Still working on SMP and NUMA. Some (maybe) interesting things I put in are
> - Sequential CPU balancing so you don't get a big storm of balances
> every 1/4s.
> - Balancing is trying to err more on the side of caution, I have to start
> analysing it more thoroughly though.
> - Attacked the NUMA balancing code. There should now be less buslocked ops /
> cache pingpongs in some fastpaths. Volanomark likes it, more realistic
> loads
> won't improve so much http://www.kerneltrap.org/~npiggin/v17/volano.png
> This improvement is NUMA only.
>
> I haven't had time to reproduce Cliff's serious reaim performance
> dropoffs so
> they're probably still there. I couldn't reproduce Martin's kernbench
> dropoff,
> but the 16-way I'm using only has 512K cache which might not show it up.
>
Okay, i put both v17 patches in the OSDL Patch Lifecycle Manager
( http://www.osdl.org/plm-cgi/plm/ )
sched-v17 is PLM #2251
sched-nopolicy-v17 is PLM #2252

Results asap.
cliffw

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