Re: [PATCH] cyclone-timer_A9
Alan Cox (alan@lxorguk.ukuu.org.uk)
08 Aug 2002 14:18:39 +0100
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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