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SubjectRe: rename() contention (BUG?)
Josef Sipek wrote:
> On Wed, Oct 25, 2006 at 03:56:34PM -0500, lkml@pengaru.com wrote:
>
>> Hello,
>>
>> I have seen some scalability problems with Maildir-based mail systems running on
>> Linux (debian sarge, 2.6.8), and after much investigation I found a large part
>> of the problem was rename() contention.
>>
>
> Just FYI, around 2.6.15 the i_sem was replace with i_mutex which is much
> better/faster. (And I would strongly suggest you upgrade.) I would actually
> like to know how much the lock contention decresed for your case.
>

The changes make the mutex more efficient, but won't decrease the
contention. It seems that all renames in one filesystem are serialized,
and if the renames require I/O (which is certainly the case with nfs),
rename throughput is severely limited.


--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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