Re: [gentoo-user] XFS FileSystem - Slow Writes

[Justin Piszcz <jpiszcz@lucidpixels.com>]

On Thu, 31 Aug 2006, Mark Kirkwood wrote:

> Mark Kirkwood wrote:
>> Ow Mun Heng wrote:
>>> 
>>> I've already updated it to the latest based on the suspend2 version.
>>> $uname -r
>>> 2.6.17-suspend2-r4
>>> 
>>> $eix xfsprogs
>>>      Available versions:  2.7.3 2.7.11 2.8.10
>>>      Installed:           2.8.10
>>> 
>>> 
>>> If not mistaken, the issue, (or barriers if not mistaken) was introduced
>>> in the 2.6.17 kernel series.
>>> the 2.6.16 series wasn't affected. (I could be wrong, I don't have net
>>> access so, I can't verify)
>>> 
>> 
>> Right - as it happens I'm doing an update today, so will let you know if 
>> I see any write performance change.
>> 
>
>
> FWIW, I've updated to 2.6.17 and I don't see any change in performance at all 
> (215Mb/s reads and 100Mb/s writes).
>
> Now I'm on the standard source tree:
>
> $ uname -r
> 2.6.17-gentoo-r7
>
> $ eix xfsprogs
>     Available versions:  2.7.3 2.7.11 ~2.8.10
>     Installed:           2.7.11
>
> which may be a factor.
>
> The other thing I notice is that my filesystems are all under 50%, whereas 
> your troublesome one was at 80%or so:
>
> $ df -m
> Filesystem           1M-blocks      Used Available Use% Mounted on
> /dev/md/2                  529       134       395  26% /
> /dev/md/0                  129        10       120   8% /boot
> /dev/md/3                 3911        32      3880   1% /tmp
> /dev/md/4                 3911       175      3737   5% /var
> /dev/md/5                19537      3008     16530  16% /usr
> /dev/md/6                19537      2668     16870  14% /home
> /dev/md/7               104841     25682     79160  25% /data0
>
> I might try writing a few big files to fill one of 'em up and see if it makes 
> any difference!
>
> Cheers
>
> Mark
> -- 
> gentoo-user@gentoo.org mailing list
>

You can also check your fragmentation, xfs_db -c frag /dev/..
and defrag it with xfs_fsir ..

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