Re: Performance versus FreeBSD 7.0

[Cyrus Massoumi]

Andi Kleen wrote:
> 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.

Yes, Nick already corrected me, sorry for the noise :)

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