Date: Tue, 21 Nov 2000 22:33:50 -0500 (EST) From: Daniel Eischen <eischen@vigrid.com> To: Alfred Perlstein <bright@wintelcom.net> Cc: John Baldwin <jhb@FreeBSD.ORG>, Jonathan Lemon <jlemon@flugsvamp.com>, arch@FreeBSD.ORG Subject: Re: Thread-specific data and KSEs Message-ID: <Pine.SUN.3.91.1001121222649.28739A-100000@pcnet1.pcnet.com> In-Reply-To: <20001121192331.E18037@fw.wintelcom.net>
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On Tue, 21 Nov 2000, Alfred Perlstein wrote:
> * Daniel Eischen <eischen@vigrid.com> [001121 19:15] wrote:
> > >
> > > Don't more segment registers cause more overhead for context switches?
> >
> > It's just one more register that has to be saved. I don't
> > think it's going to matter much.
>
> No extra TLB faults/invalidations? Aren't segment registers
> somewhat expensive to load?
Not according to swtch.s, it's just a movl instruction. I don't
need to use the segment register to address anything. I just
need to load it with a value (an index into a global array
of per-KSE structures).
If I'm being dense, feel free to smack me (just don't take too
much enjoyment in it).
--
"Some folks are into open source, but me, I'm into open bar."
-- Spencer F. Katt
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