Messages in this thread | | | Subject | RE: constant_tsc and TSC unstable | Date | Thu, 29 Nov 2007 15:29:49 -0800 | From | "Pallipadi, Venkatesh" <> |
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>-----Original Message----- >From: linux-kernel-owner@vger.kernel.org >[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Paul >Rolland (???・???) >Sent: Thursday, November 29, 2007 8:12 AM >To: Linux Kernel >Cc: rol@witbe.net >Subject: constant_tsc and TSC unstable > >Hello, > >I've a machine with a Core2Duo CPU. /proc/cpuinfo reports the flag >constant_tsc, but at boot time, I have the log : > >... >Total of 2 processors activated (6919.15 BogoMIPS). >ENABLING IO-APIC IRQs >..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1 >checking TSC synchronization [CPU#0 -> CPU#1]: >Measured 3978592228 cycles TSC warp between CPUs, turning off >TSC clock. >Marking TSC unstable due to: check_tsc_sync_source failed. >Brought up 2 CPUs >... > >This machine is running 2.6.23.1-21.fc7. I know I should >report to Fedora, >but I was wondering if this is a bug or a feature ;) >
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.
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