On Mon, Sep 03, 2012 at 09:30:26AM +0100, Jonathan Tripathy wrote:

On 03.09.2012 01:37, Kent Overstreet wrote:

quoted

Shell access would probably be fastest, I suppose...

One thing that comes to mind is perhaps the load from background
writeback is slowing things down. Two things you can do:

set writeback_percent to 10, that'll enable a pd controller so
it's not
going full blast

Hi Kent,

I will try the above configuration change and repeat the test.
However, it's worth noting that I left an overnight gap between from
when my iomater run finished and from when I started the fio test.
This was to ensure that all data had been written out to backing
storage. While I didn't check if the cache was clean or dirty in the
morning, I can confirm that there was no disk activity according to
the HDD lights on the server case.

Shoot. That probably rules that out.

Yeah, I'll probably just have to poke around at random stuff. Hopefully
it's just something burning cpu and profiling will make it obvious.