----- Original Message ---- > From: Dave Chinner <david@xxxxxxxxxxxxx> > To: Szabolcs Szakacsits <szaka@xxxxxxxxxxx>; Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>; linux-fsdevel@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; xfs@xxxxxxxxxxx > Sent: Thursday, August 21, 2008 10:25:32 AM > Subject: Re: XFS vs Elevators (was Re: [PATCH RFC] nilfs2: continuous snapshotting file system) > > On Thu, Aug 21, 2008 at 04:04:18PM +1000, Dave Chinner wrote: > > On Thu, Aug 21, 2008 at 03:15:08PM +1000, Dave Chinner wrote: > > > On Thu, Aug 21, 2008 at 05:46:00AM +0300, Szabolcs Szakacsits wrote: > > > > On Thu, 21 Aug 2008, Dave Chinner wrote: > > > > Everything is default. > > > > > > > > % rpm -qf =mkfs.xfs > > > > xfsprogs-2.9.8-7.1 > > > > > > > > which, according to ftp://oss.sgi.com/projects/xfs/cmd_tars, is the > > > > latest stable mkfs.xfs. Its output is > > > > > > > > meta-data=/dev/sda8 isize=256 agcount=4, agsize=1221440 > blks > > > > = sectsz=512 attr=2 > > > > data = bsize=4096 blocks=4885760, imaxpct=25 > > > > = sunit=0 swidth=0 blks > > > > naming =version 2 bsize=4096 > > > > log =internal log bsize=4096 blocks=2560, version=2 > > > > = sectsz=512 sunit=0 blks, lazy-count=0 > > > > realtime =none extsz=4096 blocks=0, rtextents=0 > > > > > > Ok, I thought it might be the tiny log, but it didn't improve anything > > > here when increased the log size, or the log buffer size. > > > > One thing I just found out - my old *laptop* is 4-5x faster than the > > 10krpm scsi disk behind an old cciss raid controller. I'm wondering > > if the long delays in dispatch is caused by an interaction with CTQ > > but I can't change it on the cciss raid controllers. Are you using > > ctq/ncq on your machine? If so, can you reduce the depth to > > something less than 4 and see what difference that makes? > > Just to point out - this is not a new problem - I can reproduce > it on 2.6.24 as well as 2.6.26. Likewise, my laptop shows XFS > being faster than ext3 on both 2.6.24 and 2.6.26. So the difference > is something related to the disk subsystem on the server.... > Hi Dave, just curious - which CCISS controller and and what kind of disk configuration are you using. Cheers Martin -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
