linux-kernel - 2.6.38.4: xfs speed problem?

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Message-ID: <alpine.DEB.2.02.1105071042210.20162@p34.internal.lan>
Date:	Sat, 7 May 2011 12:09:46 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	xfs@....sgi.com
cc:	linux-kernel@...r.kernel.org
Subject: 2.6.38.4: xfs speed problem?

Hello,

Using 2.6.38.4 on two hosts:

Host 1:
$ /usr/bin/time find geocities.data 1> /dev/null
80.92user 417.93system 2:19:07elapsed 5%CPU (0avgtext+0avgdata 105520maxresident)k
0inputs+0outputs (0major+73373minor)pagefaults 0swaps

# xfs_db -c frag -f /dev/sda1
actual 40203982, ideal 40088075, fragmentation factor 0.29%

meta-data=/dev/sda1              isize=256    agcount=44, agsize=268435455 blks
          =                       sectsz=512   attr=2
data     =                       bsize=4096   blocks=11718704640, imaxpct=5
          =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal               bsize=4096   blocks=521728, version=2
          =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

--

Host 2:
$ /usr/bin/time find geocities.data 1>/dev/null
54.60user 337.20system 48:42.71elapsed 13%CPU (0avgtext+0avgdata 105632maxresident)k
0inputs+0outputs (1major+72981minor)pagefaults 0swaps

# xfs_db -c frag -f /dev/sdb1
actual 37998306, ideal 37939331, fragmentation factor 0.16%

meta-data=/dev/sdb1              isize=256    agcount=10, agsize=268435455 blks
          =                       sectsz=512   attr=2
data     =                       bsize=4096   blocks=2441379328, imaxpct=5
          =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal               bsize=4096   blocks=521728, version=2
          =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0


--

Host 1: RAID-6 (7200 RPM Drives, 18+1 hot spare)
Host 2: RAID-6 (7200 RPM Drives, 12)

Each system uses a 3ware 9750-24i4e controller, same settings.

Any thoughts why one is > 2x faster than the other?

Justin.

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