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Re: [Qemu-devel] [PATCH 1/1] Make the e1000 the default network adapter

From: Stefan Weil
Subject: Re: [Qemu-devel] [PATCH 1/1] Make the e1000 the default network adapter for the pc target.
Date: Tue, 25 Aug 2009 15:51:34 +0200
User-agent: Mozilla-Thunderbird (X11/20090707)

Avi Kivity schrieb:
> On 08/14/2009 07:23 PM, Anthony Liguori wrote:
>> The ne2k is an ancient card that performs pretty terribly under
>> QEMU.  In many
>> modern OSes, there is no longer drivers available for the ne2k.
>> Switch the default network adapter to e1000.  This card is more widely
>> suppported and performs rather well under QEMU.  There may be very
>> old OSes
>> that had a ne2k driver but not an e1000 driver but I think this is
>> likely the
>> exception.
>> I think the average user is better served with an e1000 vs ne2k.
> I am unable to get Windows XP to work with the e1000 device, either
> with its built-in drivers or with Windows Update.  I think it's better
> to switch to rtl8139 (qemu-kvm's default for years now).


rtl8139 did not work on big endian hosts: link was down in linux guests.
For kvm on little endian hosts, this did not matter.
The only adapter working in any combination of host / guest endianess
was pcnet (which had the lowest performance under QEMU).

My tests are rather old (2007-09-15), so maybe this was fixed later.
And of course, e1000 was added after my tests, so I assume it is
well programmed and passes endianess tests. Did anybody check this?

Today, my latest eepro100 (e100) emulation also passes all endianess
tests, but it still does not work with any Windows OS. This might
change with the patches published recently.


PS. For endianess tests with 32 and 64 bit, QEMU's mips emulation
was very helpful. Without mips host support, this test environment
is no longer working. This is the main reason why I have no newer
test results.

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