Messages in this thread | | | Subject | Re: [RFC PATCH v3 0/3] sched: simplify the select_task_rq_fair() | From | Mike Galbraith <> | Date | Thu, 21 Feb 2013 10:43:09 +0100 |
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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.
-Mike
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