[CentOS] tick_divider

Scott McClanahan scott.mcclanahan at trnswrks.com
Thu Dec 6 16:52:09 UTC 2007


On Thu, 2007-12-06 at 07:58 -0800, Akemi Yagi wrote:
> On Dec 6, 2007 7:47 AM, Scott McClanahan <scott.mcclanahan at trnswrks.com> wrote:
> > Just installed CentOS 5.1 on VMware ESX and am attempting to play with
> > the newly added tick_divider feature.  It doesn't seem to be making any
> > difference in the number of timer interrupts though.  I set
> > tick_divider=10 which should reduce the number of timer interrupts to
> > 100.
> >
> > I wrote a nasty little scripts that queries /proc/interrupts every 1
> > second and still see an increase each second in about 1000 interrupts.
> >
> > The server is:
> >
> > uname -srvmpio
> >
> > Linux 2.6.18-53.1.4.el5 #1 SMP Fri Nov 30 00:45:16 EST 2007 i686 i686
> > i386 GNU/Linux
> >
> > Obviously not running 64bit.  Only one cpu has been allocated to this
> > vm.  Has anybody else used this successfully?
> 
> Could you add your finding to the bug report dealing with this subject?
> 
> http://bugs.centos.org/view.php?id=2189
> 
> Thanks,
> 
> Akemi
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> 

I just did.  Note I made a typo and commented on that in a second post.
Does tick_divider work successfully in a 64bit installation?  In the
changelog of the kernel installed on my test box (32bit) I see:

- [x86] Fixes for the tick divider patch (Chris Lalancette ) [305011]

Can anybody confirm that?




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