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Re: Many-metadata performance still at a loss

To: xfs@xxxxxxxxxxx
Subject: Re: Many-metadata performance still at a loss
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Thu, 10 Mar 2011 09:51:00 -0600
In-reply-to: <alpine.LNX.2.01.1103101507120.5379@xxxxxxxxxxxxxxx>
References: <alpine.LNX.2.01.1103101507120.5379@xxxxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9
Jan Engelhardt put forth on 3/10/2011 8:14 AM:
> Hi,
> 
> 
> Between 2.6.33 and 2.6.37 there was a lot of interesting announcements 
> with regards to XFS performance. However, now that I booted into 
> 2.6.37.2, I still see the metadata slowness from earlier.
> (Basically `time (tar -xf linux-2.6.37.tar.gz; sync)` - ext4 gets the 
> job done in like 15-20 seconds, xfs is still syncing after 11 minutes.)
> 
> Was there something I missed?

Yes.  You have to add "delaylog" to your mount options to enable the
metadata performance enhancement.  It won't be the default setting until
2.6.39.

-- 
Stan

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