Re: ext3 metadata performace

Avi Kivity
2006-05-11T15:43:41Z

Dieter Stüken wrote:
> after I switched from from ext2 to ext3 i observed some severe
> performance degradation. Most discussion about this topic deals
> with tuning of data-io performance. My problem however is related to
> metadata updates. When cloning (cp -al) or deleting directory trees I
> find, that about 7200 files are created/deleted per minute. Seems
> this is related to some ex3 strategy, to wait for each metadata to be
> written to disk. Interestingly this occurs with my new hw-raid
> controller (3ware 9500S), which even has an battery buffered disk cache.
> Thus there is no need for synchronous IO anyway. If I disable the
> disk cache on my plain SATA disk using ext3, I also get this behavior.
>
Try increasing the journal size (mkfs -t ext3 -J size=20000) and see if
that improves things.

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