lkml.org 
[lkml]   [2000]   [Oct]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 2.2.18Pre Lan Performance Rocks!
On Mon, Oct 30, 2000 at 11:50:24AM +0100, Ingo Molnar wrote:
>
> On Mon, 30 Oct 2000, Jeff V. Merkey wrote:
>
> > ds: and es: are both used in copy-to-user and copy-from-user and they
> > get reloaded.
>
> And they all share the same segment descriptor. Whats your point? ES is
> the default target segment for string operations. DS is the default data
> segment. Have you ever profiled how many cycles it takes to do a "mov
> __KERNEL_DS, %es" in entry.S, before making your (ridiculous) claim? I
> have.
>

No. I used a hardware analyzer to show me how many LOCK# assertions it does
invisible to your software tools underneath. Try using EMON to profile,
it gives hardware numbers and let's you watch the cache controllers
issue non-cacheable memory references to fetch the descriptors.

Jeff


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

\
 
 \ /
  Last update: 2005-03-22 12:45    [W:0.123 / U:13.404 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site