| To: | Manfred Spraul <manfred@xxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: Q: (ab)using zerocopy for drivers with alignment contraints |
| From: | Andi Kleen <ak@xxxxxx> |
| Date: | Wed, 13 Jun 2001 03:19:29 +0200 |
| Cc: | netdev@xxxxxxxxxxx |
| In-reply-to: | <3B238B31.38F6D3ED@colorfullife.com>; from manfred@colorfullife.com on Sun, Jun 10, 2001 at 04:58:57PM +0200 |
| References: | <3B238B31.38F6D3ED@colorfullife.com> |
| Sender: | owner-netdev@xxxxxxxxxxx |
On Sun, Jun 10, 2001 at 04:58:57PM +0200, Manfred Spraul wrote:
> Several cheap busmaster nics only accept tx buffers that are 32-bit
> aligned.
>
> Currently they memcpy into transfer buffers. What about replacing that
> memcpy with csum_copy_partial_nocheck and enabling NETIF_F_{SG,HW_CSUM}?
[...] I'll probably not give you much gain in 2.4 anymore. Both TCP and UDP
do csum and copy to user in most fast path cases.
-Andi
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