Skip site navigation (1)Skip section navigation (2)
Date:      Tue, 13 Jun 1995 20:43:01 +1000
From:      Bruce Evans <bde@zeta.org.au>
To:        bde@zeta.org.au, mpp@legarto.minn.net
Cc:        current@FreeBSD.ORG, roberto@blaise.ibp.fr, wollman@halloran-eldar.lcs.mit.edu
Subject:   Re: GENERIC kernel & some basic UNIX pointers
Message-ID:  <199506131043.UAA20506@godzilla.zeta.org.au>

next in thread | raw e-mail | index | archive | help
>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



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199506131043.UAA20506>