Re: disk/crypto performance regression 2.6.31 -> 2.6.32 (mmapproblem?)

[Mikael Abrahamsson]

On Fri, 19 Feb 2010, Mikael Abrahamsson wrote:

> I have a system with 8 gigs of ram, c2d 2.4GHz and md 
> raid6->crypto->lvm/lv->xfs that I've had for quite a while. It used to be 
> raid5, but with 2.6.32 I was able to restripe it into a raid6.

This is not a 2.6.32 regression, the behaviour is similar in 2.6.31 I have 
verified during the weekend.

It seems iostat isn't really able to see exactly where the bottleneck is, 
and my guess right now is that it's indeed the md raid6 layer that is 
causing my performance problems, even though it doesn't look like it in 
iostat.

--
Mikael Abrahamsson    email: swmike@xxxxxxxxx
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/