Messages in this thread |  | | | Date | Wed, 15 Nov 2006 20:03:08 +0100 | | From | Ingo Molnar <> | | Subject | Re: i386 PDA patches use of %gs |
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* Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> Ingo Molnar wrote: > > i'd not even use glibc's %gs but set up two separate selectors. > > (that's a more controlled experiment - someone might run a non-TLS > > glibc, etc.) > > > > Well, in that case they probably don't care whether the kernel uses > %fs or %gs ;) > > But either way, this doesn't have much bearing on Eric's test; we'd be > only talking about a few ns per kernel exit, rather than 5% for > read/write.
if the timings are different then it very much has bearing on the argument that i made against the current i386 PDA patchset, that mixed use segments are suboptimal.
So i'm NAK-ing the i386 PDA patchset until this has been properly measured (and fixed if needed).
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