[lkml]   [2005]   [Sep]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] x86-64: Fix bad assumption that dualcore cpus have synced TSCs
On Mon, 2005-09-19 at 21:31 +0200, Andi Kleen wrote:
> On Mon, Sep 19, 2005 at 12:16:43PM -0700, john stultz wrote:
> > 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.
> I asked AMD some time ago and they told me it was synchronized.
> The TSC on K8 is C state invariant, but not P state invariant,
> but P states always happen synchronized on dual cores.
> So I'm not quite convinced of your explanation yet.

Would a litter userspace test checking the TSC synchronization maybe
shed additional light on the issue?


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

 \ /
  Last update: 2005-09-19 21:44    [W:0.323 / U:0.496 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site