RE: Intel Xeon

[Ceylan, T. <Tol...@sa...>]

Thanks for the reply,=20

cpuinfo shows "Xeon (TM) 3.6Ghz", is this more like a generic
description that an actual CPU detection?=20

On the box, which is working cpuinfo shows "Xeon (TM) MP 3.0Ghz"

How do I determine if the kernel identifies a CPU? Is there a specific
text that I should look for in dmesg output or in cpuinfo?




-----Original Message-----
From: William Cohen [mailto:wc...@nc...]
Sent: Mon 3/13/2006 8:32 PM
To: Ceylan, Tolga
Cc: opr...@li...
Subject: Re: Intel Xeon
=20
Ceylan, Tolga wrote:
> Hello;
>=20
> I've been using oprofile on HP DL560 server with 2 x Intel Xeon MP
> 3.00Ghz
> processors. The server is loaded with Redhat AS4.0, and things
> work as expected.
>=20
> However, recently I realized that on a DL380 hardware with 2 x Intel
> Xeon 3.60Ghz hardware on RedHat AS40, the CPU type is set to "timer".=20
> These servers they all have the same SMP kernels. So, the difference
> is only the hardware.
>=20
> I am using stock RedHat kernel. Do you think the problem is due to
> an old oprofile module in Redhat stock kernels?=20
>=20
> Has anybody had any "timer" problems with Xeon processors with
> oprofile before?
>=20
> Thanks,
>=20
> Tolga Ceylan

You have a newer model processor than the RHEL4 kernel knows about.=20
OProfile needs to identify the processor to determine what kind of=20
performance monitoring hardware the processor has. If OProfile can't=20
identify the processor, it falls back on the timer interrupt mechanism.=20
/proc/cpuinfo should show the differences between the machines.

Upstream kernels identify the Xeon processors. This change should be=20
back ported to Red Hat kernel at some point.

-Will