lkml.org 
[lkml]   [2006]   [Feb]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] Define wc_wmb, a write barrier for PCI write combining
From
Date
On Tue, 2006-02-28 at 20:33 +0100, Andi Kleen wrote:

> Are you sure you used the right instruction? Normally CLFLUSH is used
> for such things, not a write barrier which really only changes ordering.

Hmm. It's possible we're just getting lucky because another write
happens somewhere else soon after the last write we perform as part of a
packet send. Perhaps, for complete correctness, we should be using
CLFLUSH instead of the last barrier. I'll have to look into this.

Thanks,

<b

-
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: 2006-02-28 20:47    [W:0.088 / U:1.792 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site