From: Jeff Moyer Date: Fri, 23 Oct 2009 21:14:50 +0000 (-0400) Subject: cfq: merge cooperating cfq_queues X-Git-Tag: v2.6.33-rc1~379^2~87 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df5fe3e8e13883f58dc97489076bbcc150789a21;p=pandora-kernel.git cfq: merge cooperating cfq_queues When cooperating cfq_queues are detected currently, they are allowed to skip ahead in the scheduling order. It is much more efficient to automatically share the cfq_queue data structure between cooperating processes. Performance of the read-test2 benchmark (which is written to emulate the dump(8) utility) went from 12MB/s to 90MB/s on my SATA disk. NFS servers with multiple nfsd threads also saw performance increases. Signed-off-by: Jeff Moyer Signed-off-by: Jens Axboe --- Reading git-diff-tree failed