lkml.org 
[lkml]   [2000]   [Feb]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: gettimeofday non-monotonic on SMP 2.3.47
On Mon, 28 Feb 2000, Alan Cox wrote:

> All the x86 cpu SMP machines have synchronized busses so the TSC rate is
> the same (so far anyway) but the TSC start on a few machines varies. 2.2.15pre
> is quite happy on such a board but the code hasnt been rewritten for 2.3.x
> as far as I know.

The TSC operates at the core cpu rate not busrate AFIK. The user I was
replying to was running both a 400 (4x100) and a 450 (4.5x100). Since the
PII/III have locked multipliers the system was actually running with two
differnt CPU speeds (he said he was and insisted that this was okay).

So, the rate there is indeed differnt. Not a good thing. :)


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

\
 
 \ /
  Last update: 2005-03-22 13:56    [W:0.172 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site