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Re: 2.6.38.4: xfs speed problem?

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: 2.6.38.4: xfs speed problem?
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Sun, 08 May 2011 12:18:31 -0500
Cc: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <20110508003321.GI26837@dastard>
References: <alpine.DEB.2.02.1105071042210.20162@xxxxxxxxxxxxxxxx> <20110508003321.GI26837@dastard>
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.17) Gecko/20110414 Thunderbird/3.1.10
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

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