Andy Colson wrote:
> So if there is very little io, or if there is way way too much, then
> the scheduler really doesn't matter. So there is a slim middle ground
> where the io is within a small percent of the HD capacity where the
> scheduler might make a difference?
That's basically how I see it. There seem to be people who run into
workloads in the middle ground where the scheduler makes a world of
difference. I've never seen one myself, and suspect that some of the
reports of deadline being a big improvement just relate to some buginess
in the default CFQ implementation that I just haven't encountered.
--
Greg Smith 2ndQuadrant Baltimore, MD
PostgreSQL Training, Services and Support
greg@2ndQuadrant.com www.2ndQuadrant.com
