From: Fabrice Bellard <fabrice@bellard.org>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Can you commit the pcnet patch ?
Date: Thu, 21 Jul 2005 23:14:32 +0200 [thread overview]
Message-ID: <42E01038.8030202@bellard.org> (raw)
In-Reply-To: <200507211419.51421.paul@codesourcery.com>
Paul Brook wrote:
> On Thursday 21 July 2005 08:29, Lars Munch wrote:
>
>>On Wed, Jul 20, 2005 at 12:32:10PM +0200, Ludovic Drolez wrote:
>>
>>>Hi !
>>>
>>>I've tried the latest AMD pcnet patch (made by Antony T Curtis) with qemu
>>>0.7 because I was tired of the sloooww PXE booting of my QEMU. For
>>>exemple, to load a linux kernel + initrd over TFTP, it takes 4m30s with a
>>>ne2000, and 1m35s with the PCNET card.
>>
>>Does anyone know why pcnet is so much faster than ne2000? is it easier
>>to emulate? or is there room for improvements on the ne2000?
>
>
> Probably because it's a DMA capable controller. IIRC the ne2k is pio based, so
> has to shuffle the data through an IO port one byte at a time.
I don't think that the switch to DMA can explain a factor of 3. Another
possibility is that there is a bug in the ne2000 code. It could be
interesting to check the send and receive latencies by adding traces in
the ne2000 code...
Fabrice.
prev parent reply other threads:[~2005-07-21 21:24 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-20 10:32 [Qemu-devel] Can you commit the pcnet patch ? Ludovic Drolez
2005-07-20 12:37 ` Paul Brook
2005-07-20 12:48 ` Christian MICHON
2005-07-21 15:32 ` Ludovic Drolez
2005-07-20 12:56 ` Ludovic Drolez
2005-07-20 14:26 ` Christian MICHON
2005-07-20 14:45 ` Christian MICHON
2005-07-20 15:19 ` Christian MICHON
2005-07-20 15:29 ` Paul Brook
2005-07-20 15:37 ` Filip Navara
2005-07-21 11:33 ` Christian MICHON
2005-07-21 16:43 ` Filip Navara
2005-07-21 20:21 ` Filip Navara
2005-07-21 20:54 ` Christian MICHON
2005-07-21 7:29 ` Lars Munch
2005-07-21 13:19 ` Paul Brook
2005-07-21 13:49 ` Christian MICHON
2005-07-21 19:10 ` Antony T Curtis
2005-07-21 21:14 ` Fabrice Bellard [this message]
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