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SubjectRe: i386 PDA patches use of %gs

* Jeremy Fitzhardinge <> 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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