2001-04-10 07:13:36

by Ulrich Windl

[permalink] [raw]
Subject: Re: announce: PPSkit patch for Linux 2.4.2 (pre6)

Hi, Cycle Counters,

Linux currently tries to synchronize TSCs for consistent time in SMP
systems. One would not believe what combinations of hardware are tried,
especially for precision timing. Here's a short answer to my asking-
back about a complaint (the kernel is reporting negative time warps).

As any problem, it can be solved with some overhead, but should it be
done?

Replies to me too, as I'm not subscribed, please.

Ulrich

On 9 Apr 2001, at 18:39, Andreas Bussjaeger wrote:

> > from the current CPU. All these values seem highly suspect. However a
> > few more values would be helpful to diagnose the situation.
>
> I have to tell you that I have one 533 MHz Celeron and one 433 MHz
> Celeron.
>
> > indicate that the CPUs are 968ms apart (each CPU half from the average).