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Date: Sun, 4 Oct 2009 00:04:03 +0200 From: Matteo Croce <technoboy85@...il.com> To: Arjan van de Ven <arjan@...radead.org> Cc: "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org Subject: Re: i686 quirk for AMD Geode On Sat, Oct 3, 2009 at 8:05 PM, Arjan van de Ven <arjan@...radead.org> wrote: > On Sat, 3 Oct 2009 04:12:47 +0200 > Matteo Croce <technoboy85@...il.com> wrote: >> >> I also did this simple test which gives a ~2.5x speed boost: >> http://pastebin.ca/1590089 > > the number that is exposed in /proc/cpuinfo does not control > if cmov is used... so the patch and the benchmark are totally unrelated. > > Anything that needs to know if cmov can be used will need to read the > flags line.. > > (since technically cmov is also optional for generation 6 and later) > > While I can't say anything against your patch, I do need to say that it > is something purely cosmetic on first sight... > > -- > Arjan van de Ven Intel Open Source Technology Centre > For development, discussion and tips for power savings, > visit http://www.lesswatts.org > yes cmov and i686 are unrelated but some distros (Debian & co.) compiles libraries for two archs: i486 and i686-cmov so only i686 machines does benefit from cmov. This is why I cared about having an i686 aware userspace but it seems that for a missing instruction I can't do that -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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