RE: Firewall performance

[David C Niemi <niemi () tux org>]

By the way, 3 copies for routing an IP packet under Linux is way off, not
even Linux 1.0 did that many ;^)  2.2 will typically do a DMA in and a DMA
out and appropriate futzing of headers; and there is a special case to do
direct NIC-to-NIC transfers with certain hardware to cut out one of those
DMAs (if I understand NET_FASTROUTE option correctly).

DCN

On Wed, 23 Jun 1999, Ryan Russell wrote:
...
> Still has to use NT routing code, no?  Just not the socket calls.
> This could still be significant, couldn't it?  I've read that the
> *BSDs can router IP with 1 memcpy of the packet, while Linux
> takes 3.  Not being terribly impressed with NT networking,
> I assume something equally bad or worse with NT.
>
>                     Ryan

-----   David C Niemi   ----niemi at tux.org----   Reston VA USA   -----
Software is largely a service industry operating under the persistent but
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