ULE/yielding patch for testing.
Pieter de Goeje
pieter at degoeje.nl
Tue Oct 2 20:19:08 PDT 2007
On Wednesday 03 October 2007, Jeff Roberson wrote:
> Enclosed is a patch that does two things:
>
> 1) Reduces UP context switch time by over 10% making it faster than 4BSD
> on UP. On SMP it's hard to compare since ULE can do as many as 30x as
> many switches per second on my 8way system.
>
> 2) Restores old sched_yield() behavior from 6.x. This was changed in
> -current unintentionally I think.
>
> I'd appreciate any extra testing. The ULE context switch time
> improvements required some changes to the frequency that we recalculate
> priorities. I'm mostly interested in hearing whether this causes any
> regression in normal workloads.
>
> Those of you still using 4BSD can also verify that the yield changes don't
> cause any problems there.
>
> Thanks,
> Jeff
No problems so far :) Seems to work great. I didn't see the (unrelated?) panic
Yuri Pankov spoke of.
Testing was done on UP am64, running KDE, kmail while listening to music and
compiling some ports. I haven't tried to run a fork bomb yet.
Cheers,
Pieter de Goeje
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