Re: Context switch times

David S. Miller (davem@redhat.com)
Thu, 04 Oct 2001 14:25:23 -0700 (PDT)

From: arjan@fenrus.demon.nl
Date: Thu, 04 Oct 2001 22:14:13 +0100

> Comments?

2.4.x supports SSE on pentium III/athlons, so the SSE registers need to be
saved/restored on a taskswitch as well.... that's not exactly free.

lat_ctx doesn't execute any FPU ops. So at worst this happens once
on GLIBC program startup, but then never again.

This assumes I understand how lazy i387 restores work in the kernel
:-)

Franks a lot,
David S. Miller
davem@redhat.com
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