lkml.org 
[lkml]   [2002]   [Sep]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] zerocopy NFS for 2.5.36
From
Date
On Thu, 2002-09-19 at 00:00, David S. Miller wrote:
> It was discussed long ago that csum_and_copy_from_user() performs
> better than plain copy_from_user() on x86. I do not remember all

The better was a freak of PPro/PII scheduling I think

> details, but I do know that using copy_from_user() is not a real
> improvement at least on x86 architecture.

The same as bit is easy to explain. Its totally memory bandwidth limited
on current x86-32 processors. (Although I'd welcome demonstrations to
the contrary on newer toys)

-
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: 2005-03-22 13:28    [W:0.155 / U:1.340 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site