From: Robin Holt <holt@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH] - sched_clock() broken for ia64 SN platform
Date: Thu, 20 Nov 2003 19:23:18 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106935637330507@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-106928980122896@msgid-missing>
On Thu, Nov 20, 2003 at 10:32:29AM -0800, David Mosberger wrote:
> >>>>> On Thu, 20 Nov 2003 09:23:35 -0600, Jack Steiner <steiner@sgi.com> said:
>
> Jack> This is slightly off-topic, but the shared platform counter on
> Jack> the SGI platform isnt a single counter. The counter is
> Jack> replicated in each chipset It is synchronized thruout the
> Jack> system so that all cpus will see the same value - ie., no
> Jack> drift. Reading the counter does not required any off-node
> Jack> references. There shouldnt be any scaling issues.
>
> Ah, that's good. Just for future reference, what's the approximate
> latency of reading this counter?
I haven't tested it recently, but it was approx 55nSec on a 900Mhz
Madison.
next prev parent reply other threads:[~2003-11-20 19:23 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-20 0:56 [PATCH] - sched_clock() broken for ia64 SN platform John Hawkes
2003-11-20 1:24 ` David Mosberger
2003-11-20 4:09 ` John Hawkes
2003-11-20 6:01 ` David Mosberger
2003-11-20 15:23 ` Jack Steiner
2003-11-20 17:25 ` Grant Grundler
2003-11-20 17:25 ` Rich Altmaier
2003-11-20 18:32 ` David Mosberger
2003-11-20 19:20 ` Robin Holt
2003-11-20 19:23 ` Robin Holt [this message]
2003-11-20 20:58 ` John Hawkes
2003-11-20 21:27 ` David Mosberger
2003-11-20 21:58 ` john stultz
2003-11-20 22:14 ` John Hawkes
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