From: john stultz <johnstul@us.ibm.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Marcelo Tosatti <marcelo@conectiva.com.br>,
lkml <linux-kernel@vger.kernel.org>,
Leah Cunningham <leahc@us.ibm.com>,
wilhelm.nuesser@sap.com, paramjit@us.ibm.com, msw@redhat.com,
James Cleverdon <jamesclv@us.ibm.com>
Subject: Re: [PATCH] cyclone-timer_A9
Date: 08 Aug 2002 19:03:37 -0700 [thread overview]
Message-ID: <1028858618.1118.7.camel@cog> (raw)
In-Reply-To: <1028812719.28882.34.camel@irongate.swansea.linux.org.uk>
On Thu, 2002-08-08 at 06:18, Alan Cox wrote:
> On Thu, 2002-08-08 at 03:15, john stultz wrote:
> > Marcelo,
> > This patch (which applies on top of my tsc-disable_B9 patch as well as
> > James Cleverdon's summit patch), is a performance improvement for
> > multi-CEC IBM x440 systems which suffer from drifting TSCs. Rather then
> > forcing do_gettimeofday to call do_slow_gettimeoffset and access the PIT
> > (as my tsc-disable patch does), passing "cyclone" as a boot option will
> > make do_gettimeofday use a 100Mhz performance counter found in the
> > Summit chipset.
>
> Why not probe for the summit chipset ?
Yea, its on my list. Once Jame's patch settles down I plan to piggy back
off that.
Thanks!
-john
next prev parent reply other threads:[~2002-08-09 2:22 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-08 1:53 [PATCH] tsc-disable_B9 john stultz
2002-08-08 2:15 ` [PATCH] cyclone-timer_A9 john stultz
2002-08-08 13:18 ` Alan Cox
2002-08-09 2:03 ` john stultz [this message]
2002-08-08 13:17 ` [PATCH] tsc-disable_B9 Alan Cox
2002-08-09 2:30 ` john stultz
2002-08-09 9:17 ` Alan Cox
2002-08-09 17:46 ` john stultz
2002-08-09 18:49 ` george anzinger
2002-08-09 20:58 ` john stultz
2002-08-13 1:23 ` James Cleverdon
2002-08-11 20:16 ` Alan Cox
2002-08-15 16:56 ` Andrea Arcangeli
2002-08-16 11:15 ` Alan Cox
2002-08-16 13:19 ` Mikael Pettersson
2002-08-21 13:12 ` Andrea Arcangeli
2002-08-21 14:10 ` Alan Cox
2002-08-21 14:33 ` Andrea Arcangeli
2002-08-21 15:01 ` Alan Cox
2002-08-21 16:13 ` Andrea Arcangeli
2002-08-21 16:25 ` Alan Cox
2002-08-21 17:17 ` Andrea Arcangeli
2002-08-21 17:34 ` Alan Cox
2002-08-26 16:10 ` Pavel Machek
2002-08-26 18:45 ` Martin J. Bligh
2002-08-26 19:00 ` Pavel Machek
2002-08-26 19:05 ` Alan Cox
2002-08-26 20:19 ` Martin J. Bligh
2002-08-26 19:18 ` Richard B. Johnson
2002-08-26 19:42 ` Pavel Machek
2002-08-26 20:23 ` Alan Cox
2002-08-26 22:49 ` Andrea Arcangeli
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