2.6.38.4: xfs speed problem?
From: Justin Piszcz
Date: Sat May 07 2011 - 12:09:53 EST
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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