On Tue, 2010-08-31 at 22:34 +0200, Aurelien Jarno wrote: [...] > The GNU libc simply uses a kernel syscall to get this time. My guess is > that it happens when the thread is moving from one CPU to another, the > RDTSC are jumping are they are not synchronized.
The implementation isn't so stupid as to trust TSCs entirely.
> Anyway, as I think it is a kernel bug, I am reassigning it to this
> package.
I think this bug may have been fixed in Linux 2.6.33 by:
commit 0696b711e4be45fa104c12329f617beb29c03f78
Author: Lin Ming <ming.m....@intel.com>
Date: Tue Nov 17 13:49:50 2009 +0800
timekeeping: Fix clock_gettime vsyscall time warp
which was then backported into stable kernel 2.6.32.19 and Debian
version 2.6.32-21. Manuel, please update your kernel to 2.6.32-21 and
re-test.
Ben.
--
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.
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