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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: kuznet@ms2.inr.ac.ru's message of "Mon, 18 Dec 2000 22:30:31 +0300 (MSK)"
References: <200012181930.WAA32333@ms2.inr.ac.ru>
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?

Jes


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