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Date: Tue, 10 Nov 2009 14:29:33 -0800 From: "H. Peter Anvin" <hpa@...or.com> To: Lennart Sorensen <lsorense@...lub.uwaterloo.ca> CC: Willy Tarreau <w@....eu>, Pavel Machek <pavel@....cz>, Avi Kivity <avi@...hat.com>, Alan Cox <alan@...rguk.ukuu.org.uk>, Matteo Croce <technoboy85@...il.com>, Sven-Haegar Koch <haegar@...net.de>, Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org Subject: Re: i686 quirk for AMD Geode On 11/10/2009 02:27 PM, Lennart Sorensen wrote: > On Tue, Nov 10, 2009 at 01:19:30PM -0800, H. Peter Anvin wrote: >> Willy, perhaps you can come up with a list of features you think should >> be emulated, together with an explanation of why you opted for that list >> of features and *did not* opt for others. >> >> Note: emulated FPU is a special subcase. The FPU operations are >> heavyweight enough that the overhead of trapping versus library calls is >> relatively insignificant. > > That doesn't seem to be the experience of the arm EABI versus the old > arm ABI with kernel FPU emulation. Using user space library calls for > FPU is vastly faster than the trapping and kernel FPU emulation. I don't believe we were talking about ARM. -hpa -- 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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