On 6 May 2011 19:57, David Gilbert <david.gilb...@linaro.org> wrote: > 2011/5/6 Christian Robottom Reis <k...@linaro.org>: > I don't think there are that many things that are vastly useful for the > kernel, > but here is a summary (I intend to write a full report at some point but > am still fighting SPEC for some benchmark stats and some of the corner cases > of these routines)
Along those lines, I'm going to again refer to Altivec use in other kernels/OSes, perhaps it might give some ideas to people: http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/powerpc/oea/altivec.c?rev=1.23&content-type=text/x-cvsweb-markup&only_with_tag=MAIN In NetBSD/powerpc, Altivec is used for vm page zeroing and copying. I don't really know the speed gains, but given altivec's bus to L2 cache was 128 bits (compared to 32-bits of the integer unit) I guess it was probably worth to incorporate such a change. (No, I don't have NetBSD installed, but I did code Altivec for 5 years so I know some things in detail.) I'm just mentioning this without knowing if this is actually possible or relevant in the Linux kernel. If it isn't, just ignore my post :) Regards Konstantinos _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
