On Wed, Sep 24, 2014 at 6:59 PM, Andrei Mikhailovsky <andrei at arhont.com> wrote:
> Ilya,
>
> Was wondering if you've had a chance to look into performance issues with
> rbd and the patched kernel? I've downloaded 3.16.3 and running some dd
> tests, which were producing hang tasks in the past. I've noticed that i
> can't get past 20mb/s on the rbd mounted volume. I am sure I was hitting
> over 60MB/s before.
I reproduced the dd-in-a-loop slowdown you were seeing but haven't
investigated or compared to older kernels yet. I haven't seen any hung
task splats though, it chunked along and not so slow as to cause 120
seconds timeouts.
Thanks,
Ilya
