>
> On Fri, 2008-08-01 at 10:44 +0530, Dhaval Giani wrote:
> > On Fri, Aug 01, 2008 at 08:39:14AM +0800, Zhang, Yanmin wrote:
> > >
> > > On Thu, 2008-07-31 at 15:49 +0800, Zhang, Yanmin wrote:
> > > > On Thu, 2008-07-31 at 09:39 +0200, Peter Zijlstra wrote:
> > > > > On Thu, 2008-07-31 at 15:31 +0800, Zhang, Yanmin wrote:
> > > > > > On Thu, 2008-07-31 at 11:20 +0800, Zhang, Yanmin wrote:
> > > > > > > Ingo,
> > > > > > >
> > > > > > Oh, it looks like they are the old issues in 2.6.26-rc1 and the 2 patches were reverted before 2.6.26.
> > > > > > New patches are merged into 2.6.27-rc1, but the issues are still not resolved clearly.
> > > > > >
http://www.uwsg.iu.edu/hypermail/linux/kernel/0805.2/1148.html.
> > > > >
> > > > > The new smp-group stuff doesn't remotely look like what was in .26
> > > > >
> > > > > Also, on my quad (admittedly smaller than your machines) both volano and
> > > > > sysbench didn't regress anymore - where they clearly did with the code
> > > > > reverted from .26.
> > > > The regression I reported exists on:
> > > > 1) 8-core+HT(totally 16 logical processor) tulsa: 40% regression with volano, 8% with oltp;
> > > > 2) 8-core+HT Montvale Itanium: 9% regression with volano; 8% with oltp;
> > > > 3) 16-core tigerton: %70 with volano, %18 with oltp;
> > > > 4) 8-core stoakley: %15 with oltp, testing failed with volanoMark.
> > > >
> > > > So the issues are popular on different architectures.
> > > I know kernel needs the features and it might not be a good idea to reject them over and over again.
> > > I will collect more data on tigerton and try to optimize it.
> >
> > Hi Yanmin,
> >
> > Would it be possible for you to switch of the group scheduling feature
> > and see if the regression still exists. In all our testing, we did not
> > see a regression. I would like to eliminate it from your testing as
> > well.
> I tested with CONFIG_GROUP_SCHED=n. To test faster, I simplified the benchmark parameter.
>
> volanoMark:
> kernel | result
> ----------------------------------------------------------
> 2.6.27-rc1_group | 205901
> ----------------------------------------------------------
> 2.6.27-rc1_nogroup | 303377
> ----------------------------------------------------------
> 2.6.26_group | 529388
>
