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Re: alignment issues on netif_rx

To: kuznet@xxxxxxxxxxxxx
Subject: Re: alignment issues on netif_rx
From: Jes Sorensen <jes@xxxxxxxxxxxxx>
Date: 18 Dec 2000 21:27:37 +0100
Cc: netdev@xxxxxxxxxxx, davem@xxxxxxxxxx
In-reply-to:'s message of "Mon, 18 Dec 2000 22:30:31 +0300 (MSK)"
References: <>
Sender: owner-netdev@xxxxxxxxxxx
User-agent: Gnus/5.070096 (Pterodactyl Gnus v0.96) Emacs/20.4
>>>>> "kuznet" == kuznet  <kuznet@xxxxxxxxxxxxx> writes:

kuznet> Hello!
>> The problem is that some cards like the Tulip and Starfire don't
>> allow misaligned DMA.

kuznet> Aligned dma can be always used and, if protocol happens to be
kuznet> ethernet II, headers can be copied for faulty
kuznet> architectures. Actually, I am even not sure that misaligned
kuznet> accesses for intel are better than copy.

This still requires that the card can DMA to multiple buffers, or are
you suggesting to copy out the header no matter what?


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