You can either grab the rpm off of SuSE's website or run "rug install 
kernel-default" .


Marcy

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-----Original Message-----
From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of David K. 
Kelly
Sent: Friday, May 29, 2009 12:16 PM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: [LINUX-390] High interrupt rate

Hi Rob

Is it possible to just down load the kernel patch for this and not all the
extra packages
that you get when you request an update?

Thank you

David Kelly
The Supreme Court of Virginia





             Rob van der Heij
             <rvdh...@velocity
             software.com>                                              To
             Sent by: Linux on         LINUX-390@VM.MARIST.EDU
             390 Port                                                   cc
             <linux-...@vm.mar
             IST.EDU>                                              Subject
                                       Re: High interrupt rate

             05/28/2009 01:48
             PM


             Please respond to
             Linux on 390 Port
             <linux-...@vm.mar
                 IST.EDU>






On Thu, May 28, 2009 at 5:12 PM, Deric Abel <da...@americafirst.com> wrote:

> We are running sles10 sp2 not redhat, so I am not sure if this bug was in
any of the red hat releases.  The kernel that comes with sp2 was
2.6.16.60-0.21, and the most recent kernel for sp2 is
2.6.16.60-0.37  (remember that the number after the "-" is the rpm
build/release version, so that will be different between distros).  I am
not sure want the underlying problem was, but from this mailing list it
seems there was a bug in the sles10sp2 kernel and it's fixed with the
newest.  So unless someone else would like to explain the bug, that's all
the information I have.

The cause is that the application asks for a wakeup in 1 ms or so
(this is silly design since it is polling). The kernel only provides
10 ms granularity and rounded incorrectly to 0 ms, thus making the
silly thing pretty bad. It also shows very high CP overhead when this
happens.
The fix is that the kernel rounds it to 10 ms to limit the impact.

Martin just told me the fix is in: 2.6.18-124.el5 für RedHat RHEL5 und
2.6.16.60-0.34 für SuSE SLES10

--
Rob van der Heij
Velocity Software
http://www.velocitysoftware.com/

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