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SubjectRe: 2.6.14-rc2-mm1
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 johnstul@us.ibm.com Mon Sep 26 09:04:08 2005
> Date: Mon, 19 Sep 2005 12:16:43 -0700
> From: john stultz <johnstul@us.ibm.com>
> To: Andrew Morton <akpm@osdl.org>
> Cc: lkml <linux-kernel@vger.kernel.org>, Andi Kleen <ak@suse.de>
> 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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