Date: Mon, 15 Jan 1996 16:57:34 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: cher@test.phys.msu.su (Alicher O Alikhodjaev) Cc: hackers@FreeBSD.ORG Subject: Re: your mail Message-ID: <199601151557.QAA09105@labinfo.iet.unipi.it> In-Reply-To: <199601151322.QAA06200@test.phys.msu.su> from "Alicher O Alikhodjaev" at Jan 15, 96 04:22:11 pm
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> SUMMARY: > This patch adds multicast support for 3c5x9 (ep) driver > INSTALLATION: > cd /sys # your local kernel source tree > patch -p < this_file > # then rebuild your kernel Does the 3c5x9 have an internal hash table for (partial) filtering of incoming multicasts ? If it does, I do not see any code here (or in the 2.1R if_ep.c) to set the hash table according to the content of the multicast address list. If it doesn't, it means that any multicast address effectively puts the board in promiscuous mode -> the kernel must process and discard any non-matching packet -> lots of work on a busy segment, and not certainly the thing you want to build a router. I am asking because I was looking at some 3c5xx driver for Linux a couple of days ago, and it implemented multicast by switching to promiscuos mode. I suspect many ethernet drivers may have this problem. Luigi ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 http://www.iet.unipi.it/~luigi/ ====================================================================
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