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Bug#600031: updating kernel causes slow write speed to raid

On Thu, 2010-10-14 at 15:16 +0100, Dave Clarke wrote:
> Ben
> That has solved it. Now getting around 27MB/s write on ext4 and 97MB/s
> read with the experimental kernel. I'm happy with these speeds on this
> hardware. It is still a little slower then with windows but I can live
> with that.

Good, but I'm concerned as to why 2.6.32 is so much worse.  Since that
will be the kernel version in Debian 6.0 I want to make sure it does
perform well.

> May be able to get better by tuning read-ahead buffer and
> vm.dirty_ratio. Do you think there is any merit in adjusting these?

I don't know; this isn't my area of expertise.


Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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