According to
http://dimitrik.free.fr/blog/archives/2010/12/mysql-performance-analyzing-perconas-tpcclike-workload-on-mysql-55.html
the xtraDB is ignoring the io capacity setting.
But this of course it might be just a minor bug in the percona version
that dimitriK used in his test..:-)

akops

On 14/2/2011 7:16 μμ, Ewen Fortune wrote:
> Hi,
>
>> Also after reading Dimitrik blog
>> (http://dimitrik.free.fr/blog/archives/2010/07/mysql-performance-innodb-io-capacity-flushing.html),
>> its seems to me , than one of the thing that are different between the
>> stock mysql (5.5) and xtradb, is the way that they handle IO capacity
>> and flush. So if you need to control the IO then you should use the
>> stock mysql.
> Just to clarify, you can run with the same flushing algorithm under
> Percona server and the same io capacity options are available.
>
> http://www.percona.com/docs/wiki/percona-server:features:innodb_io#innodb_io_capacity
>
> The io_capacity feature actually came from the Google and Percona patches
>
> http://www.innodb.com/wp/products/innodb_plugin/license/third-party-contributions-in-innodb-plugin-1-0-4/
>
> Cheers,
>
> Ewen
>

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