Re: Performance versus FreeBSD 7.0

[Andi Kleen]

Cyrus Massoumi <cyrusm@xxxxxxx> writes:
>
> IIRC, going to fine-grained file locking gave them a huge boost in
> this particular benchmark (and maybe others).

What locking? You mean their equivalent of i_mutex? There are 
already file systems on Linux that don't use it significantly
for write.

> As I said on lwn.net Peter Zijlstra posted a patch to break the global
> file list lock about a year ago [1], but I don't think it was ever
> merged. Here [2] are some numbers for the patchset.

The file_list_lock is only for open/close which MySQL is very unlikely
to do in its fast path. You're totally on the wrong path here I think.

-Andi
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