Re: [Bug #11308] tbench regression on each kernel release from2.6.22 -> 2.6.28

[Ingo Molnar]

* Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Mon, 17 Nov 2008, Ingo Molnar wrote:
> 
> > Christoph, as per the recent analysis of Mike:
> >
> >  http://fixunix.com/kernel/556867-regression-benchmark-throughput-loss-a622cf6-f7160c7-pull.html
> >
> > all scheduler components of this regression have been eliminated.
> >
> > In fact his numbers show that scheduler speedups since 2.6.22 have
> > offset and hidden most other sources of tbench regression. (i.e. the
> > scheduler portion got 5% faster, hence it was able to offset a
> > slowdown of 5% in other areas of the kernel that tbench triggers)
> 
> Ok will rerun the tests tomorrow. Just got back from SC08 need some 
> time to catch up.
> 
> Looks like a lot of work was done on this issue. Thanks!

You might also want to try net-next:

 [remote "net-next"]
        url = git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6.git
        fetch = +refs/heads/*:refs/remotes/net-next/*

Some good stuff is in there too, impacting this workload.

	Ingo
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