[dm-devel] Re: Do not overload dispatch queue (Was: Re: IO scheduler based IO controller V10)

[Mike Galbraith]

On Sat, 2009-10-03 at 09:56 -0400, Vivek Goyal wrote:

> I have kept the overload delay period as "cfq_slice_sync" same as Mike had
> done. We shall have to experiment what is a good waiting perioed. Is 100ms
> too long if we are waiting for a request from same process which recently
> finished IO and we did not enable idle on it.
> 
> I guess we can tweak the delay period as we move along.

I kept the delay period very short to minimize possible damage. Without
the idle thing, it wasn't enough, but with, worked a treat, as does your
patch.

	-Mike