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[Xen-devel] Re: [kvm-devel] [PATCH] e1000 emulation code

To: dor.laor@xxxxxxxxxxxx
Subject: [Xen-devel] Re: [kvm-devel] [PATCH] e1000 emulation code
From: Alex Williamson <alex.williamson@xxxxxx>
Date: Wed, 09 Jan 2008 16:40:08 -0700
Cc: kvm-devel <kvm-devel@xxxxxxxxxxxxxxxxxxxxx>, ir Peleg <nir@xxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, qemu-devel <qemu-devel@xxxxxxxxxx>, xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
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On Wed, 2008-01-09 at 18:42 +0200, Dor Laor wrote:
> It which supports TCP/UDP and IP transmit checksum, as well as TSO.
> It has been tested with Linux (2.6.18|22|23|24)++ and Windows XP (using
> the driver supplied at the intel download site).
> Windows Vista recognizes it but there is no traffic.
> Checksum calculation is currently naïve and unoptimized (the host
> kernel does it better). But when working in conjuction to tso
> the performance is drastically better.
> Some figures: Linux rx 350Mbps, tx 150bps, Windows rx 700mbps, tx 100 mbps.
> The e1000_hw.h is copied from Linux kernel.
> Also attached is the pxe boot option rom that works with netboot.

   Nice!  I did the trivial port of this to Xen and tested that it works
with both Linux and Windows guests on ia64 (Windows Server 2003 with
drivers from intel.com, 2008 with shipped drivers).  Port attached below
for anyone else that wants to try it.  We should definitely pick this up
in Xen when it goes upstream too.  Thanks,


Alex Williamson                             HP Open Source & Linux Org.

Attachment: xen-qemu-e1000.patch
Description: Text Data

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