This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


RE: [Xen-devel] Linux TCP Checksum offload limitations

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: RE: [Xen-devel] Linux TCP Checksum offload limitations
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Sat, 5 Apr 2008 21:23:25 +1100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Sat, 05 Apr 2008 03:23:54 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <20080405101739.GA21162@xxxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <AEC6C66638C05B468B556EA548C1A77D013DC2D9@trantor> <20080405101739.GA21162@xxxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AciXBl717qM+BagWQu6+ZbP/hCx16gAABZiw
Thread-topic: [Xen-devel] Linux TCP Checksum offload limitations
> > Can someone please confirm that this is a limitation of Linux and/or
> > Xen?
> What version of Windows has this problem?

I am not seeing it on Windows 2003 sp1 or sp2, but am seeing it on XP sp2.

Andy is seeing it on XP sp2 and I think Windows 2003.

> Did you find out anything about it yet?

We're working on it. The solution I'm testing right now involves copying the 
header fragments to a single buffer. Not sure what it will do for performance...


Xen-devel mailing list