[CentOS] measuring kernel speed

[JohnS]

On Mon, 2010-05-10 at 07:31 -0700, Akemi Yagi wrote:
> On Mon, May 10, 2010 at 6:46 AM, Ross Walker <rswwalker at gmail.com> wrote:
> > On May 10, 2010, at 8:53 AM, JohnS <jses27 at gmail.com> wrote:
> 
> >> You say efficiency loss.  That could mean anything from the power
> >> input
> >> down to the kernel.  It looks like that can be determined by oprofile
> >> and latencytop.  Latencytop will give you the millisecond time for
> >> execution. As far as Oprofile maybe Ross will indeed fill us in if he
> >> can.
> >
> > Oprofile will show where those precious latencies timings are being
> > used. It of course adds latency itself, so this should be factored
> > into the latency timings.
> >
> > It will time all kernel operations then you can drill down into
> > particular modules/routines to see more granularity.
> >
> > Needs debug symbols to be fully useful. Can provide timings as source
> > code annotations.
> 
> I never thought someone would run oprofile with the RT kernel. I can
> upload debuginfo if anyone needs it.
> 
> Akemi

Actually you need kernel-trace also in there.  Trace is what is
recomended by TUV.

John