From owner-freebsd-current Tue Jun 13 03:48:32 1995 Return-Path: current-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id DAA10581 for current-outgoing; Tue, 13 Jun 1995 03:48:32 -0700 Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.34]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id DAA10542 for ; Tue, 13 Jun 1995 03:48:23 -0700 Received: (from bde@localhost) by godzilla.zeta.org.au (8.6.9/8.6.9) id UAA20506; Tue, 13 Jun 1995 20:43:01 +1000 Date: Tue, 13 Jun 1995 20:43:01 +1000 From: Bruce Evans Message-Id: <199506131043.UAA20506@godzilla.zeta.org.au> To: bde@zeta.org.au, mpp@legarto.minn.net Subject: Re: GENERIC kernel & some basic UNIX pointers Cc: current@FreeBSD.ORG, roberto@blaise.ibp.fr, wollman@halloran-eldar.lcs.mit.edu Sender: current-owner@FreeBSD.ORG Precedence: bulk >I guess that I will have to run some user-mode/kernel-mode tests >myself. If it really does turn out that the kernel-mode >ppp interface is poorly implemented, I could probably be talked >into trying to make it better, especially since I'm stuck with a ppp-only >ISP now. If anyone has any suggestions towards this goal, let >me know. The kernel-mode ppp efficiency is good enough for one line. At most it can be improved by 6% at 115200 bps (sustained) or 1.5% at 28800 bps (average) on a 486DX2/66. You wouldn't notice 1.5% overhead. However, if you have 50 lines then you would notice 75% overhead. 50 lines at 28800 is only 1/7 of an ethernet's bandwidth so 75% overhead seems excessive. Bruce