linux-kernel - Re: [discuss] Re: [PATCH] Allow all Opteron processors to change pstate at same time

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Message-ID: <20060716015636.GC21162@atrey.karlin.mff.cuni.cz>
Date:	Sun, 16 Jul 2006 03:56:36 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Joachim Deguara <joachim.deguara@....com>
Cc:	"shin, jacob" <jacob.shin@....com>, Andi Kleen <ak@...e.de>,
	"Langsdorf, Mark" <mark.langsdorf@....com>, discuss@...-64.org,
	linux-kernel@...r.kernel.org, cpufreq@...ts.linux.org.uk
Subject: Re: [discuss] Re: [PATCH] Allow all Opteron processors to change pstate at same time

> On Thu, 2006-07-13 at 13:06 +0000, Pavel Machek wrote:
> > Can you run two such tests *in parallel*? That seemed to break it
> > really quickly.
> parallel sounds fun, but I don't get it.  Two machine or trying to go
> online and offline at the same time?  Firestorming two busy parallel

Trying to online and offline at the same time.

> while loops, one turning the core offline and the other online, did not
> bring an oops so I guess this kernel is in the clear in that regard.

Better run two tight loops, each doing online; offline. I got reports
it crashed machines before, but maybe it is solved.

> I can't get it to crash again and I am afraid that it crashed under an
> old devel kernel.  After another ~20 hour test with heavy freq changes
> with the tscsync patch
> 
> CPU 1: Syncing TSC to CPU 0.
> CPU 1: synchronized TSC with CPU 0 (last diff 4 cycles, maxerr 499
> cycles)
> ...
> CPU 2: Syncing TSC to CPU 0.
> CPU 2: synchronized TSC with CPU 0 (last diff -105 cycles, maxerr 600
> cycles)
> ...
> CPU 3: Syncing TSC to CPU 0.
> CPU 3: synchronized TSC with CPU 0 (last diff -122 cycles, maxerr 1126
> cycles)
> 
> 
> after 5 hours of no PowerNow!
> 
> CPU 1: Syncing TSC to CPU 0.
> CPU 1: synchronized TSC with CPU 0 (last diff -3 cycles, maxerr 598
> cycles)
> ...
> CPU 2: Syncing TSC to CPU 0.
> CPU 2: synchronized TSC with CPU 0 (last diff -124 cycles, maxerr 1129
> cycles)
> ...
> CPU 3: Syncing TSC to CPU 0.
> CPU 3: synchronized TSC with CPU 0 (last diff -124 cycles, maxerr 1127
> cycles)
> 
> 
> huh?? I don't understand but it does not matter what I do or how long I
> do it, the difference looks to always be about the same.  
> 
> -joachim
> 
> 
> 

-- 
Thanks, Sharp!
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