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
> 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.
> -- 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
> xfs mailing list
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