From owner-freebsd-questions Thu Aug 10 07:34:07 1995 Return-Path: questions-owner Received: (from majordom@localhost) by freefall.FreeBSD.org (8.6.11/8.6.6) id HAA05532 for questions-outgoing; Thu, 10 Aug 1995 07:34:07 -0700 Received: from halloran-eldar.lcs.mit.edu (halloran-eldar.lcs.mit.edu [18.26.0.159]) by freefall.FreeBSD.org (8.6.11/8.6.6) with SMTP id HAA05524 for ; Thu, 10 Aug 1995 07:34:03 -0700 Received: by halloran-eldar.lcs.mit.edu; (5.65/1.1.3.6) id AA06035; Thu, 10 Aug 1995 10:34:02 -0400 Date: Thu, 10 Aug 1995 10:34:02 -0400 From: Garrett Wollman Message-Id: <9508101434.AA06035@halloran-eldar.lcs.mit.edu> To: Mike Hench Cc: questions@freebsd.org Subject: networking q's In-Reply-To: <199508092354.SAA00818@watt.cae.uwm.edu> References: <199508092354.SAA00818@watt.cae.uwm.edu> Sender: questions-owner@freebsd.org Precedence: bulk < said: > 1) is it possible to change the priority of kernel networking ? No. The kernel networking code is driven by hardware (network interface and timer) interrupts. While it might be an interesting exercise to attach a process context to the network interrupt service routines, the only likely result would be a dramatic increase in jitter and decrease in performance. > say to a specific realtime priority FreeBSD is not a real-time operating system, sorry. > totally kill user processes. (the machine is a router > with *5* ISA cards :-) You are almost certainly suffering from the heavy bus load because the common ISA Ethernet cards don't do DMA, so every packet is laboriously copied off the adapter's shared memory and into the main store. > 2) are there any good multiport EISA (or PCI) enet cards that work with FBSD. There is supposedly someone out there who makes a card with four DC21040's and a PCI-PCI bridge on it, which would probably help quite a lot for your application. -GAWollman -- Garrett A. Wollman | Shashish is simple, it's discreet, it's brief. ... wollman@lcs.mit.edu | Shashish is the bonding of hearts in spite of distance. Opinions not those of| It is a bond more powerful than absence. We like people MIT, LCS, ANA, or NSA| who like Shashish. - Claude McKenzie + Florent Vollant