Re: 2.6.14-rc2-mm1

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


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?


>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

	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:

Please consider for inclusion in your tree.


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;
  	/* Assume multi socket systems are not synchronized */
  	return num_online_cpus() > 1;

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at
Please read the FAQ at

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]
  Powered by Linux