Bug#661580: mkfs.xfs fails to detect correct sector size

[Christoph Hellwig <hch@infradead.org>]

Carlos, didn't you plan to look into this issue?

Goswin, how do you determin that mkfs is still doing unaligned I/O
when forcing the large sevtor size?  Once we set the sector size XFS
can't do I/O smaller than it.

On Tue, Feb 28, 2012 at 08:49:14AM +0100, Goswin von Brederlow wrote:
> Package: xfsprogs
> Version: 3.1.7
> Severity: important
> File: /sbin/mkfs.xfs
> 
> Hi,
> 
> since I recently bought a harddisk with 4K sector size I've been
> checking for correct alignment and blocksizes in various things. One
> of them being xfs.
> 
> When I partition the disk in parted it shows correctly to have a
> logical blocksize of 512 byte and physical blocksize of 4096 byte.
> But mkfs.xfs does not detect that the physical blocksize is 4096 byte
> and creates a filesystem with:
> 
> meta-data=/dev/sde1              isize=256    agcount=32, agsize=22892696 blks
>          =                       sectsz=512   attr=2
> data     =                       bsize=4096   blocks=732566272, imaxpct=5
>          =                       sunit=0      swidth=0 blks
> naming   =version 2              bsize=4096   ascii-ci=0
> log      =internal               bsize=4096   blocks=357698, version=2
>          =                       sectsz=512   sunit=0 blks, lazy-count=1
> realtime =none                   extsz=4096   blocks=0, rtextents=0
> 
> 
> This often results in access to the disk that is not aligned to the
> blocksize with the resulting degradation in performance.
> 
> Further, manually selecting the right sector size of 4096 still causes
> lots of unaligned access while formating and while mounting the
> filesystem. It does seem to fix the problem for actual use though.
> 
> MfG
> 	Goswin
> 
> -- System Information:
> Debian Release: wheezy/sid
>   APT prefers unstable
>   APT policy: (500, 'unstable')
> Architecture: amd64 (x86_64)
> 
> Kernel: Linux 3.1.0-1-amd64 (SMP w/4 CPU cores)
> Locale: LANG=C, LC_CTYPE=de_DE (charmap=ISO-8859-1)
> Shell: /bin/sh linked to /bin/dash
> 
> Versions of packages xfsprogs depends on:
> ii  libblkid1     2.20.1-1
> ii  libc6         2.13-21 
> ii  libreadline5  5.2-11  
> ii  libuuid1      2.19.1-5
> 
> xfsprogs recommends no packages.
> 
> Versions of packages xfsprogs suggests:
> pn  acl      2.2.51-4  
> pn  attr     1:2.4.46-3
> pn  quota    <none>    
> pn  xfsdump  <none>    
> 
> -- no debconf information
> 
> 
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---end quoted text---


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