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Date: Wed, 11 Feb 2015 10:08:16 -0600
From: Eric Sandeen <sandeen@sandeen.net>
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Subject: Re: XFS buffer IO performance is very poor
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To: yy <yy@xspring.net>, xfs <xfs@oss.sgi.com>

On 2/11/15 1:39 AM, yy wrote:

<snip>

(In addition to Brian's questions):

> XFS format parametes:
> 
> #mkfs.xfs -d su=256k,sw=5 /dev/sdb1
> 
> #cat /proc/mounts
> 
> /dev/sdb1 /data1 xfs rw,noatime,attr2,delaylog,nobarrier,logbsize=256k,sunit=512,swidth=2560,noquota 0 0
> 
> #fdisk -ul
> Device Boot      Start         End      Blocks   Id  System
> /dev/sdb1             128  2929356359  1464678116   83  Linux

so 128*512 = 64k; your partition doesn't start on a 256k stripe unit boundary,
right?  Shouldn't it do so?

-Eric

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