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Subject: Re: [PATCH] cyclone-timer_A9
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: john stultz <johnstul@us.ibm.com>
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>
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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 ?

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