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Date: Sun, 08 May 2011 12:18:31 -0500 From: Stan Hoeppner <stan@...dwarefreak.com> To: Dave Chinner <david@...morbit.com> CC: Justin Piszcz <jpiszcz@...idpixels.com>, linux-kernel@...r.kernel.org, xfs@....sgi.com Subject: Re: 2.6.38.4: xfs speed problem? On 5/7/2011 7:33 PM, Dave Chinner wrote: > On Sat, May 07, 2011 at 12:09:46PM -0400, Justin Piszcz wrote: >> 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 How much would it help, if any, with this specific 'test', or with overall XFS performance, if Justin were to... >> Host 1: RAID-6 (7200 RPM Drives, 18+1 hot spare) remake the fs on the above device with 'sw=16' or remount with appropriate sunit and swidth values? >> Host 2: RAID-6 (7200 RPM Drives, 12) remake the fs on the above device with 'sw=10' or remount with appropriate sunit and swidth values? -- Stan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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