Messages in this thread | | | Date | Sat, 26 Jan 2002 12:25:05 -0500 | From | Jeff Garzik <> | Subject | Re: question about sparc 64-bit user land |
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Felix von Leitner wrote: > > My understanding is that there is no 64-bit user land support for > UltraSPARC, although the kernel runs in 64-bit mode. Is that correct? > If yes: why is that (still) so?
sparc64 has an in-kernel thunk layer that lets it run sparc32 binaries, and a sparc32 userland.
Presumeably the standard benefits apply for 32 over 64 bits, such as lower I-cache usage and smaller programs overall. Though most Linux/Unix applications seem to work ok on 64-bit, (a) some don't and (b) few apps actually take good advantage of 64-bit machine int and address space.
Of course, all that said, coming from an Alpha AXP background I prefer 64-bit userland ;-)
Jeff
-- Jeff Garzik | "I went through my candy like hot oatmeal Building 1024 | through an internally-buttered weasel." MandrakeSoft | - goats.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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