lkml.org 
[lkml]   [2006]   [Nov]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: i386 PDA patches use of %gs

* 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).

Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-11-15 20:09    [from the cache]
©2003-2011 Jasper Spaans. Advertise on this site