Re: [RT] read_tsc: ACK! TSC went backward! Unsynced TSCs?

[Lee Revell]

On Mon, 2005-11-28 at 09:30 -0800, thockin@xxxxxxxxxx wrote:
> The kernel's use of TSC is wholly incorrect.  TSCs can ramp up and
> down and *do* vary between nodes as well as between cores within a
> node.  You really can not compare TSCs between cpu cores at all, as is
> (and the kernel assumes 1 global TSC in at least a few places). 

That's one way to look at it; another is that the AMD dual cores have a
broken TSC implementation.  The kernel's use of the TSC was never a
problem in the past...

Lee

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/