Re: 2.6.38.4: xfs speed problem?

[Stan Hoeppner]

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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