On Mon, Sep 26, 2005 at 09:14:02AM +0200, Tim Schmielau wrote: > On Sun, 25 Sep 2005, Paul Blazejowski wrote: > > > Upon quick testing the latest mm kernel it appears there's some kind of > > race condition when using dual core cpu esp when using XORG and USB > > (although PS2 has same issue) kebyboard rate being too fast. > > Does the following patch by John Stultz fix the problem? > > Tim Tim, No it does not, from my understanding it only pertains to x86_64 but currently i run i386 SMP enabled kernel on the dualcore X2 processor. Also worth noting is that i do not see any failures or errors in dmesg related to lost timers. Perhaps this is something new? I even run a script from the bugzilla and the output matched both cpu's. Thanks, Paul > > > From [email protected] Mon Sep 26 09:04:08 2005 > Date: Mon, 19 Sep 2005 12:16:43 -0700 > From: john stultz <[email protected]> > To: Andrew Morton <[email protected]> > Cc: lkml <[email protected]>, Andi Kleen <[email protected]> > Subject: [PATCH] x86-64: Fix bad assumption that dualcore cpus have synced > TSCs > > Andrew, > This patch should resolve the issue seen in bugme bug #5105, where it > is assumed that dualcore x86_64 systems have synced TSCs. This is not > the case, and alternate timesources should be used instead. > > For more details, see: > http://bugzilla.kernel.org/show_bug.cgi?id=5105 > > > Please consider for inclusion in your tree. > > thanks > -john > > diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c > --- a/arch/x86_64/kernel/time.c > +++ b/arch/x86_64/kernel/time.c > @@ -959,9 +959,6 @@ static __init int unsynchronized_tsc(voi > are handled in the OEM check above. */ > if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) > return 0; > - /* All in a single socket - should be synchronized */ > - if (cpus_weight(cpu_core_map[0]) == num_online_cpus()) > - return 0; > #endif > /* Assume multi socket systems are not synchronized */ > return num_online_cpus() > 1; > > >
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