Re: [tbench regression fixes]: digging out smelly deadmen.

Jiri Kosina
2008-10-27T13:43:15Z

On Mon, 27 Oct 2008, Mike Galbraith wrote:

> > real world workloads. If your fairness hurts throughput that much maybe
> > your scheduler algorithm is just plain *wrong* as it isn't adapting to
> > workload at all well.
> Doesn't seem to be scheduler/fairness. 2.6.22.19 is O(1), and falls
> apart too, I posted the numbers and full dbench output yesterday.

We'll need to look into this a little bit more I think. I have sent out
some numbers too, and these indicate very clearly that there is more than
50% performance drop (measured by dbench) just after the very merge of CFS
in 2.6.23-rc1 merge window.

--
Jiri Kosina
SUSE Labs