From: Jonathan Larmour <jlarmour@redhat.com>
To: Andrea Acquaviva <aacquaviva@deis.unibo.it>
Cc: "ecos-discuss@sources.redhat.com" <ecos-discuss@sources.redhat.com>
Subject: Re: [ECOS]Strongarm rtc and oscr
Date: Tue, 13 Feb 2001 09:05:00 -0000 [thread overview]
Message-ID: <3A896945.B4930864@redhat.com> (raw)
In-Reply-To: <3A894DE3.A9D479FD@deis.unibo.it>
Andrea Acquaviva wrote:
>
> I want to measure eCos multi-threading energy costs. I use it on the
> assabet board.
Have you looked at the tm_basic kernel test?
> In order to measure context switch overhead, I need some infos about
> timeslicing:
>
> - the option CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS refers to 3.6864MHz
> clock ticks?
Yes.
> - How does eCos use real time clock (RTC) and operating system timer
> (OSCR) of
> StrongARM 1110?
An interesting question because we are considering changing the way it
operates right now! The interesting part is in
hal/arm/sa11x0/var/current/src/sa11x0_misc.c and hal_clock_rest() and
hal_clock_read(). Currently it resets it to 0 each interrupt, but we may be
about to change it to make it a freerunning counter.
Jifl
--
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine
next prev parent reply other threads:[~2001-02-13 9:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-13 7:07 Andrea Acquaviva
2001-02-13 9:05 ` Jonathan Larmour [this message]
2001-02-14 2:53 ` Andrea Acquaviva
2001-02-14 9:01 ` Jonathan Larmour
2001-02-14 5:54 ` [ECOS] Bluetooth on eCos - available Nilendu Pal
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