On Tue, Feb 01, 2011 at 07:30:09PM -0600, Alex Elder wrote: > On Tue, 2011-01-25 at 14:58 +1100, Dave Chinner wrote: > > From: Dave Chinner <dchinner@xxxxxxxxxx> > > > > test 042 generates a worst-case fragmented filesystem and uses it to > > test xfs_fsr. It uses small 4k files to generate the hole-space-hole > > pattern that fragments free space badly. It is much faster to > > generate the same pattern by creating a single large file and > > punching holes in it. Also, instead of writing large files to > > create unfragmented space, just use preallocation so we don't have > > to write the data to disk. > > > > These changes reduce the runtime of the test on a single SATA drive > > from 106s to 27s. > > > > Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx> > > Perhaps your test system is configured different > from mine, but I don't see the speedup you see. > In fact, it might have slowed it down. I really > haven't experimented much though and will report > back if I find anything more constructive to say. That may be because the resvsp call at the moment is a sync transaction. I've got a patch to make that async which should solve the problem for you. Mind you, the above numbers come from a Vm that wasn't running that patch, so it probably depends mostly on how efficient your storage is a processing barriers to the difference you see right now... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
