lkml.org 
[lkml]   [2002]   [Aug]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: packet re-ordering on SMP machines.
From
Date
On Sun, 2002-08-25 at 08:18, Ben Greear wrote:
> By re-ordered, I mean that a method called from process_backlog in dev.c
> is being handed packets in a different order than they are being poked into
> the driver with hard_start_xmit on the other interface. If each CPU can be running the
> process_backlog, then I can see how this could be happening.
>
>
> 1) Is this expected behaviour?
Yes

> 2) Is there any standard (ie configurable) way to enforce strict ordering on an
> SMP system?
No

> 3) If answer to 2 is no, would you all be interested in a patch that
> did allow strict ordering (if indeed I can figure out how to write one)?

You should never need it. Ethernet, hubs, switches, routers, internet
backbones etc will all cause packet re-ordering. You should also expect
the percentage of re-ordered frames on the net to rise and rise.


-
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    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site