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 <email@example.com> Date: Tue Nov 17 13:49:50 2009 +0800 timekeeping: Fix clock_gettime vsyscall time warp which was then backported into stable kernel 126.96.36.199 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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