On 07/02/13 21:29, Carsten Aulbert wrote:

Hi

On 02/07/2013 11:12 AM, Adam Goryachev wrote:

quoted

Do you have any information on what your workload is, or how/why these
values might help?

Most of our data servers are exporting data read-only via NFS. It helped
well on these but more on download servers which allowed us to go from
200k 4MB downloads per day to 1M/day while adding new files constantly.

quoted

You are changing values significantly from the default, and I am
cautious that they may cause other issues. Also, someone else has
advised to reduce nr_requests rather than increasing it?

I know, but these larger queues really helped a lot in re-ordering
requests to better match the hardware underneath - but again, this was
for hard drives with physical arms and not SSDs

OK, this makes a lot more sense then :) Definitely slowing things
down/making the opportunity to re-order requests should help a lot for
spinning disks... I don't see that helping much at all with SSD's though.

Thanks,
Adam


-- 
Adam Goryachev
Website Managers
www.websitemanagers.com.au