[CentOS] measuring kernel speed

[JohnS]

On Mon, 2010-05-10 at 07:40 -0500, Les Mikesell wrote:
> JohnS wrote:
> > On Sun, 2010-05-09 at 21:46 -0400, Ross Walker wrote:
> >> On Sat, May 8, 2010 at 7:38 PM, JohnS <jses27 at gmail.com> wrote:
> >>> On Sat, 2010-05-08 at 16:17 -0400, Ross Walker wrote:
> >>>> On May 8, 2010, at 8:35 AM, Mag Gam <magawake at gmail.com> wrote:
> >>>>
> >>>>> At our Physics research labs we do a lot with low latency networks. We
> >>>>> have been using Centos for over 3 years now and its been great! We
> >>>>> would like to tune and optimize our setup by removing unneeded
> >>>>> packages -- kernel modules to be specific. I was wondering, how does
> >>>>> one measure the speed of the kernel. Is that even possible?
> >>>> Use oprofile.
> >>>>
> >>>> -Ross
> >>> ---
> >>> Ross, never mind I just yummed it onto a machine there faq is inheritly
> >>> wrong.
> >> The FAQ is only correct in respect to the project's view.
> >>
> >> Redhat has a custom oprofile that works with their custom kernels, so
> >> stock oprofile from the project's site IS incompatible, but that's OK
> >> cause RH provides one that works with their distro.
> >>
> >> -Ross
> > ---
> > Correct as i found out.
> 
> Would this also be suitable for testing efficiency loss from running under 
> VMware or other virtualization methods?
---
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.

John