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authorPaul Clements <paul.clements@steeleye.com>2008-02-23 15:23:50 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-23 17:12:15 -0800
commit48f15b93b2c9f4ec9b8af08ab78f7a27db7c8378 (patch)
tree8fc5a20c743fe7e223502a08b9b15d31912ef7de /fs
parent2f56debd77a8f52f1ac1d3c3d89cc7ce5e083230 (diff)
NBD: make nbd default to deadline I/O scheduler
NBD doesn't work well with CFQ (or AS) schedulers, so let's default to something else. The two problems I have experienced with nbd and cfq are: 1) nbd hangs with cfq on RHEL 5 (2.6.18) -- this may well have been fixed There's a similar debian bug that has been filed as well: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=447638 There have been posts to nbd-general mailing list about problems with cfq and nbd also. 2) nbd performs about 10% better (the last time I tested) with deadline vs. cfq (the overhead of cfq doesn't provide much advantage to nbd [not being a real disk], and you end up going through the I/O scheduler on the nbd server anyway, so it makes sense that deadline is better with nbd) Signed-off-by: Paul Clements <paul.clements@steeleye.com> Cc: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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