RE: Dual core Athlons and unsynced TSCs

Roger Heflin
2006-01-13T15:00:33Z

> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org
> [mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Lee Revell
> Sent: Thursday, January 12, 2006 4:18 PM
> To: linux-kernel
> Subject: Dual core Athlons and unsynced TSCs
>
> It's been known for quite some time that the TSCs are not
> synced between cores on Athlon X2 machines and this screws up
> the kernel's timekeeping, as it still uses the TSC as the
> default time source on these machines.
>
> This problem still seems to be present in the latest kernels.
> What is the plan to fix it? Is the fix simply to make the
> kernel use the ACPI PM timer by default on Athlon X2?

Do we know if this also affects dual-core opterons?

The symptoms are that the clocks run at 2x the speed, correct?

Roger