From: "David S. Miller" <davem@redhat.com>
To: johnstul@us.ibm.com
Cc: anton.wilson@camotion.com, linux-kernel@vger.kernel.org
Subject: Re: do_gettimeofday vs. rdtsc in the scheduler
Date: Tue, 17 Sep 2002 13:39:33 -0700 (PDT) [thread overview]
Message-ID: <20020917.133933.69057655.davem@redhat.com> (raw)
In-Reply-To: <1032294559.22815.180.camel@cog>
From: john stultz <johnstul@us.ibm.com>
Date: 17 Sep 2002 13:29:18 -0700
Some NUMA boxes do not have synced TSC, so on those systems your
code won't work.
It would have been really nice if x86 had specified a "system tick"
register that incremented based upon the system bus cycles and thus
were immune the processor rates.
I foresee lots of patches coming which basically are "how does this
x86 system provide a stable synchronized tick source".
next prev parent reply other threads:[~2002-09-17 20:43 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200209172020.g8HKKPF13227@eng2.beaverton.ibm.com>
2002-09-17 20:29 ` Fwd: do_gettimeofday vs. rdtsc in the scheduler john stultz
2002-09-17 20:39 ` David S. Miller [this message]
2002-09-17 20:57 ` john stultz
2002-09-17 20:56 ` David S. Miller
[not found] <200209172020.g8HKKPF13227@eng2.beaverton.ibm.com.suse.lists.linux.kernel>
[not found] ` <1032294559.22815.180.camel@cog.suse.lists.linux.kernel>
[not found] ` <20020917.133933.69057655.davem@redhat.com.suse.lists.linux.kernel>
2002-09-17 21:00 ` Andi Kleen
2002-09-17 20:54 ` David S. Miller
2002-09-17 21:28 ` Alan Cox
2002-09-17 21:18 ` David S. Miller
2002-09-17 22:02 ` James Cleverdon
2002-09-17 22:44 ` Andi Kleen
2002-09-17 22:38 ` David S. Miller
2002-09-17 22:55 ` James Cleverdon
2002-09-17 23:12 ` David S. Miller
2002-09-17 23:32 ` john stultz
2002-09-17 23:32 ` David S. Miller
2002-09-17 23:52 ` Andi Kleen
2002-09-17 23:46 ` David S. Miller
2002-09-17 23:58 ` Andi Kleen
2002-09-17 23:51 ` David S. Miller
2002-09-18 0:05 ` Andi Kleen
2002-09-18 1:04 ` James Cleverdon
2002-09-19 18:02 ` Andrea Arcangeli
2002-09-20 11:04 ` Maciej W. Rozycki
2002-09-19 11:20 ` Mikael Pettersson
2002-09-19 13:27 ` Alan Cox
2002-09-19 13:39 ` Mikael Pettersson
2002-09-20 15:26 ` John Levon
2002-09-18 6:40 ` Vojtech Pavlik
2002-09-19 18:04 ` Andrea Arcangeli
2002-09-09 22:21 anton wilson
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