Re: Intel Xeon

[Hiro Y. <hyo...@mi...>]

Hi,

The following is a quick and dirty hack. Please try it.

diff -ur linux-2.6.9-11.19AX/arch/i386/oprofile/nmi_int.c linux-2.6.9-11.19AXcustom/arch/i386/oprofile/nmi_int.c
--- linux-2.6.9-11.19AX/arch/i386/oprofile/nmi_int.c    2004-10-19 06:55:24.000000000 +0900
+++ linux-2.6.9-11.19AXcustom/arch/i386/oprofile/nmi_int.c  2005-12-22 13:54:09.000000000 +0900
@@ -313,7 +313,7 @@
 {
        __u8 cpu_model = current_cpu_data.x86_model;

-       if (cpu_model > 3)
+       if (cpu_model > 4)
                return 0;

 #ifndef CONFIG_SMP

Hiro

From: "Ceylan, Tolga" <Tol...@sa...>
Subject: RE: Intel Xeon
Date: Mon, 13 Mar 2006 20:45:37 -0600
Message-ID: <618...@s2...>

> 
> Thanks for the reply, 
> 
> cpuinfo shows "Xeon (TM) 3.6Ghz", is this more like a generic
> description that an actual CPU detection? 
> 
> 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
>  
> Ceylan, Tolga wrote:
> > Hello;
> > 
> > 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.
> > 
> > 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". 
> > These servers they all have the same SMP kernels. So, the difference
> > is only the hardware.
> > 
> > I am using stock RedHat kernel. Do you think the problem is due to
> > an old oprofile module in Redhat stock kernels? 
> > 
> > Has anybody had any "timer" problems with Xeon processors with
> > oprofile before?
> > 
> > Thanks,
> > 
> > Tolga Ceylan
> 
> You have a newer model processor than the RHEL4 kernel knows about. 
> OProfile needs to identify the processor to determine what kind of 
> performance monitoring hardware the processor has. If OProfile can't 
> identify the processor, it falls back on the timer interrupt mechanism. 
> /proc/cpuinfo should show the differences between the machines.
> 
> Upstream kernels identify the Xeon processors. This change should be 
> back ported to Red Hat kernel at some point.
> 
> -Will
>