Bug#600031: updating kernel causes slow write speed to raid
On 15 October 2010 02:33, Ben Hutchings <email@example.com> wrote:
> On Thu, 2010-10-14 at 15:16 +0100, Dave Clarke wrote:
>> 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.
I'd be happy to test some fixes to 2.6.32 to find the source of the
problem if there is anything you want me to try.
>> 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.