On Fri, Jun 20, 2008 at 12:55 PM, Florin Andrei <florin@xxxxxxxxxxxxxxx> wrote:
>> Anyway, I did a test with the 2.6.18-93.el5.bz444759 kernel and there's no
>> difference: 65 minutes, 27 MB/s. Looks like it doesn't matter which kernel I
>> use, at least for this simple test with dd.
No. Since you're using the driver from 3ware/amcc you are not going to
experience this particular performance hit. Only if you're using the
stock 3ware driver which is built into the kernel.
> As a side note, the artificial benchmark reveals a huge difference between
> Ext3 and XFS - the latter is much faster when writing. Might be an artifact
> of some setting (after all, I do use a hardware RAID card). But the
> difference is very real.
>
> I was planning to use XFS anyway, so I'm not sure if I'll spend too much
> time troubleshooting Ext3.
>
> I don't think this is some kind of hidden effect of the MWI bug.
>
Nope. This is just a long-standing performance thing. You can tune
ext3 to perform better, but on a 3ware card xfs will win, hands down.
--
During times of universal deceit, telling the truth becomes a revolutionary act.
George Orwell
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