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Date: Tue, 10 Nov 2009 13:19:30 -0800 From: "H. Peter Anvin" <hpa@...or.com> To: Willy Tarreau <w@....eu> CC: 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 01:12 PM, Willy Tarreau wrote: > yes, just like with emulated FPU or trapped unaligned accesses. It's > just like flying fishes. They exist but they aren't the most common > ones. If people encounter these cases on a specific program, then > they just have to recompile it if it is a problem. At least they > don't rebuild the whole distro. And once again, I've been using > cmpxchg/bswap emulation for years on my i386 without feeling any > need for a rebuild, and CMOV emulation for years now on my mini-itx > C3 without any problem either. These are real experiences, not just > fears of imaginary problems. Yes I can design a program to run 400 > times slower on these machines if I want. I just don't feel the need > to do so and apparently existing programs' authors didn't either. 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. -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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