Messages in this thread Patch in this message |  | | | Date | Mon, 26 Sep 2005 09:14:02 +0200 (CEST) | | From | Tim Schmielau <> | | Subject | Re: 2.6.14-rc2-mm1 |
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
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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