i was wrong, i misread the first question, and he told me, GMP is in userspace. by kernel "handling of the SIMD regs" he meant the switch from one userspace task to another, i think.
what do you mean by "in a limited context"? Can you use SIMD in kernel code regs if you avoid preemtion? joerg On Fr, 24.02.2006, 01:24, Benjamin Herrenschmidt sagte: > On Thu, 2006-02-23 at 17:17 +0100, Joerg Maier wrote: >> Hi, >> >> you cannot use SIMD registers in kernel as far as i know. The kernel >> does >> not save these registers when changing userspace/kernel mode (i think >> for >> performance reason) so these registers have to stay untouched when you >> are >> in kernel mode. > > ahhh ... I assumed he was doing userland... if he's doing kernel, he can > still but in a very limited context, like the RAID6 does, though I > wouldn't recommend it unless there is a very very very good reason to do > so. > > Ben. > > > > -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
