Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

Ingo Molnar
2008-11-19T20:14:44Z

* Christoph Lameter <cl-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org> 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