RE: Delete scheduler SD_WAKE_AFFINE and SD_WAKE_BALANCE flags

From: Chen, Kenneth W
Date: Thu Jul 28 2005 - 18:51:28 EST

Nick Piggin wrote on Thursday, July 28, 2005 4:35 PM
> Wake balancing provides an opportunity to provide some input bias
> into the load balancer.
> For example, if you started 100 pairs of tasks which communicate
> through a pipe. On a 2 CPU system without wake balancing, probably
> half of the pairs will be on different CPUs. With wake balancing,
> it should be much better.

Shouldn't the pipe code use synchronous wakeup?

> I hear you might be having problems with recent 2.6.13 kernels? If so,
> it would be really good to have a look that before 2.6.13 goes out the
> door.

Yes I do :-(, apparently bumping up cache_hot_time won't give us the
performance boost we used to see.

- Ken

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