linux-kernel - Re: constant_tsc and TSC unstable

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Message-ID: <20071130075258.24a785d4@tux.DEF.witbe.net>
Date:	Fri, 30 Nov 2007 07:52:58 +0100
From:	"Paul Rolland (ポール・ロラン)" 
	<rol@...be.net>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>, rol@...be.net
Subject: Re: constant_tsc and TSC unstable

Hello,

On Thu, 29 Nov 2007 15:29:49 -0800
"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com> wrote:



> TSCs on Core 2 Duo are supposed to be in sync unless CPU supports deep idle
> states like C2, C3. Can you send the full /proc/cpuinfo and full dmesg.
> 
Sure I can...
[root@tux log]# cat /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU         T5300  @ 1.73GHz
stepping        : 2
cpu MHz         : 800.000
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat ps
e36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmo
n pebs bts pni monitor ds_cpl est tm2 ssse3 cx16 xtpr lahf_lm
bogomips        : 3461.13
clflush size    : 64

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 CPU         T5300  @ 1.73GHz
stepping        : 2
cpu MHz         : 800.000
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat ps
e36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmo
n pebs bts pni monitor ds_cpl est tm2 ssse3 cx16 xtpr lahf_lm
bogomips        : 3458.02
clflush size    : 64

Regards,
Paul
Download attachment "dmesg" of type "application/octet-stream" (30696 bytes)