lkml.org 
[lkml]   [2008]   [Nov]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Bug #12064] [regression] Measured 688 cycles TSC warp; marking TSC unstable

* Frans Pop <elendil@planet.nl> wrote:

> On Saturday 22 November 2008, Rafael J. Wysocki wrote:
> > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12064
> > Date : 2008-11-16 19:27:43 (7 days old)
> > References : http://marc.info/?l=linux-kernel&m=122686370308852&w=2
>
> Looks to be fixed in -rc6:
>
> -Calibrating delay using timer specific routine.. 6198.05 BogoMIPS (lpj=12396107)
> +Calibrating delay using timer specific routine.. 6399.82 BogoMIPS (lpj=12799647)
> [...]
> -checking TSC synchronization [CPU#0 -> CPU#1]:
> -Measured 696 cycles TSC warp between CPUs, turning off TSC clock.
> -Marking TSC unstable due to check_tsc_sync_source failed
> +checking TSC synchronization [CPU#0 -> CPU#1]: passed.
>
> So, BogoMIPS value on CPU#1 is in line with CPU#0 again and TSC passes.
> No idea what commit would be responsible.

this one from Venki fixed it:

| commit 93ce99e849433ede4ce8b410b749dc0cad1100b2
| Author: Venki Pallipadi <venkatesh.pallipadi@intel.com>
| Date: Mon Nov 17 14:43:58 2008 -0800
|
| x86: add rdtsc barrier to TSC sync check

Ingo


\
 
 \ /
  Last update: 2008-11-23 17:35    [W:0.074 / U:1.492 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site