Re: i386/x86_64 segment register issuses (Re: PATCH: Fix x86 segment register access)

["H. J. Lu" <hjl@lucon.org>]

On Thu, Mar 31, 2005 at 02:57:57AM +0200, Pau Aliagas wrote:
> On Wed, 30 Mar 2005, H. J. Lu wrote:
> 
> >>>That is what the assembler generates, and should have generated, for
> >>>"movw %ds,(%eax)" since Nov. 4, 2004.
> >>
> >>Could this be the reason for the reported slowdown in the last six months?
> >
> >Can you elaborate?
> 
> There's an unexplained slowdown of kernel 2.6 detailed in this thread:
> http://kerneltrap.org/node/4940
> 

It is dated as "November 13, 2002 - 13:58". The assembler change was
made on Nov. 4, 2004. I don't think they are related at all.

> I don't want at all to justify it with the change you talk about in gas, 
> but maybe it is worth to check if it has anything to do with it. The 
> slowdown happened in this last six months.


H.J.
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