Re: Nick's scheduler v17

[cliff white]

On Sat, 25 Oct 2003 04:10:24 +1000
Nick Piggin <piggin@xxxxxxxxxxxxxxx> 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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