Re: [RFC PATCH v3 0/3] sched: simplify the select_task_rq_fair()

From: Mike Galbraith
Date: Thu Feb 21 2013 - 04:43:29 EST

On Thu, 2013-02-21 at 17:08 +0800, Michael Wang wrote:

> But is this patch set really cause regression on your Q6600? It may
> sacrificed some thing, but I still think it will benefit far more,
> especially on huge systems.

We spread on FORK/EXEC, and will no longer will pull communicating tasks
back to a shared cache with the new logic preferring to leave wakee
remote, so while no, I haven't tested (will try to find round tuit) it
seems it _must_ hurt. Dragging data from one llc to the other on Q6600
hurts a LOT. Every time a client and server are cross llc, it's a huge
hit. The previous logic pulled communicating tasks together right when
it matters the most, intermittent load... or interactive use.


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