From owner-freebsd-hackers Tue Jul 9 08:50:13 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id IAA17260 for hackers-outgoing; Tue, 9 Jul 1996 08:50:13 -0700 (PDT) Received: from eldorado.net-tel.co.uk (eldorado.net-tel.co.uk [193.122.171.253]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id IAA17223 for ; Tue, 9 Jul 1996 08:49:53 -0700 (PDT) From: Andrew.Gordon@net-tel.co.uk Received: (from root@localhost) by eldorado.net-tel.co.uk (8.6.12/8.6.10) id QAA19827 for hackers@freebsd.org; Tue, 9 Jul 1996 16:49:12 +0100 Received: from "/PRMD=NET-TEL/ADMD=GOLD 400/C=GB/" by net-tel.co.uk (Route400-RFCGate); Tue, 9 Jul 96 16:44:45 +0100 X400-Received: by mta "eldorado" in "/PRMD=net-tel/ADMD=gold 400/C=gb/"; Relayed; Tue, 9 Jul 96 16:44:45 +0100 X400-Received: by mta "net-tel cambridge" in "/PRMD=net-tel/ADMD=gold 400/C=gb/"; Relayed; Tue, 9 Jul 96 15:44:44 +0000 X400-Received: by "/PRMD=NET-TEL/ADMD=Gold 400/C=GB/"; Relayed; Tue, 9 Jul 96 15:44:44 +0000 X400-MTS-Identifier: ["/PRMD=NET-TEL/ADMD=Gold 400/C=GB/";hst:4758-960709154444-076B] X400-Content-Type: P2-1984 (2) X400-Originator: Andrew.Gordon@net-tel.co.uk Original-Encoded-Information-Types: IA5-Text X400-Recipients: hackers@freebsd.org Date: Tue, 9 Jul 96 15:44:44 +0000 X400-Content-Identifier: Re: Fwd: Paralle Message-Id: <"11605-960709154831-76DC*/G=Andrew/S=Gordon/O=NET-TEL Computer Systems Ltd/PRMD=NET-TEL/ADMD=Gold 400/C=GB/"@MHS> To: hackers@freebsd.org In-Reply-To: <31E1DB6C.167EB0E7@FreeBSD.org> Subject: Re: [Fwd: Parallel laplink abuse leads to death of kernel secondary timer] Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > Yow, this one's pretty cool! :-) I guess we always knew that PLIP was a > high-overhead proposition, but it's interesting to see that it only > croaks on the Pentium. However, most Pentium systems are new enough to have ECP-capable parallel ports, which could in principle give a much lower overhead if someone had the time to work on the driver.... Note that with the current driver, the overhead will be maximised with two systems of very different performance talking to each other, since the fast system will spend lots of time in a busy loop waiting for the other to respond.