Date: Thu, 30 Sep 2004 23:43:23 +0200 From: Marius Strobl <marius@alchemy.franken.de> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/sparc64/sparc64 machdep.c Message-ID: <20040930234323.M69188@newtrinity.zeist.de> In-Reply-To: <50355.1096576012@critter.freebsd.dk>; from phk@phk.freebsd.dk on Thu, Sep 30, 2004 at 10:26:52PM %2B0200 References: <20040930214021.A84755@newtrinity.zeist.de> <50355.1096576012@critter.freebsd.dk>
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On Thu, Sep 30, 2004 at 10:26:52PM +0200, Poul-Henning Kamp wrote: > In message <20040930214021.A84755@newtrinity.zeist.de>, Marius Strobl writes: > > >> Funny you should ask. Testing the first version of this patch was how > >> we found the bug in counter.c - the machine I booted the test kernel > >> with happened to decide the counter-timer wasn't suitable either due > >> to the bug and it came up with no timecounters. You should see what > >> happens to a machine that's not keeping time. :-) > > I know :-) > > I wrote the code so you wouldn't be in doubt something was wrong. > > >> We are drastically low on timecounter-capable devices on sparc64 > >> though, it seems the counter-timer and the CPU are about all there > >> is. > > We just need one good one, so as long as they have that we're fine. > > I thought the 1usec counter were a sparc-architecture thing which > all machines had ? > Doesn't look like bridges other than the UPA2SBus and the Psycho UPA2PCI one used on sun4u machines have a counter-timer device or something similar (look e.g. at panther.freebsd.org which is equipped with a Sabre UPA2PCI bridge).
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