Subject: Re: HEADS UP: timecounters (branch simonb-timecounters) merged into
To: Frank Kardel <kardel@netbsd.org>
From: Mike Pumford <mpumford@black-star.demon.co.uk>
List: tech-kern
Date: 09/10/2006 14:26:49
Frank Kardel wrote:
> Mike Pumford wrote:
> Congrats, pls run t.c as an additional test to test that time does not ever
> go backwards. You should *not* see any *negative* diff values from t.c
> positive ones are usually ok due to scheduling.
>
Seems to pass the no negative diff values test. The test program
consistently complains about a positive difference. I've attached a
couple of lines of output:
bad time TSA: 0x4504123e.05781845, TSB: 0x4504123e.0610d5ea, diff =
10010021 nsec, 20000040 nsec
bad time TSA: 0x4504123e.06a94761, TSB: 0x4504123e.07420506, diff =
10010021 nsec, 20000540 nsec
Is this within tolerance or have I got some tweaking to do. The system
is a 200MHz StrongARM system with a fairly slow DRAM memory bus.
Mike