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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-12-07 15:07:31 +0100
committerIngo Molnar <mingo@elte.hu>2011-12-21 10:34:44 +0100
commit518cd62341786aa4e3839810832af2fbc0de1ea4 (patch)
treebd28f7fce47887e9c5d33bd772c8380255ef3065 /crypto
parent612ef28a045efadb3a98d4492ead7806a146485d (diff)
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sched: Only queue remote wakeups when crossing cache boundaries
Mike reported a 13% drop in netperf TCP_RR performance due to the new remote wakeup code. Suresh too noticed some performance issues with it. Reducing the IPIs to only cross cache domains solves the observed performance issues. Reported-by: Suresh Siddha <suresh.b.siddha@intel.com> Reported-by: Mike Galbraith <efault@gmx.de> Acked-by: Suresh Siddha <suresh.b.siddha@intel.com> Acked-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Chris Mason <chris.mason@oracle.com> Cc: Dave Kleikamp <dave.kleikamp@oracle.com> Link: http://lkml.kernel.org/r/1323338531.17673.7.camel@twins Signed-off-by: Ingo Molnar <mingo@elte.hu>
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