Date: Tue, 13 Jun 1995 11:47:13 +0900 From: Atsushi Murai <amurai@spec.co.jp> To: tom@uniserve.com Cc: current@FreeBSD.ORG Subject: Re: GENERIC kernel & some basic UNIX pointers Message-ID: <9506130247.AA00039@tama3.spec.co.jp.spec.co.jp> In-Reply-To: <Pine.BSF.3.91.950612192423.16318A-100000@haven.uniserve.com>
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Tom Samplonius <tom@uniserve.com> wrote:
:
:On Tue, 13 Jun 1995, Atsushi Murai wrote:
:
:> How about turn off modem compression with draft Predictor-1 compression and
:> please watch a time not only a elaps but also system overhead.
:> You might get different results ;-)
:
: What besides iij-ppp supports predictor-1 compression?
:
:Tom
:
I am not export in this area but I think it will be common compression with
ppp protcol like Vj-compression. As you might know, VJ-compression is already
popular but it's just compression(get rid of redundancy) of tcp/ip header.
But Predictor-1 will try compression whole date when talk to peer ppp.
This will give us two advantage as follows:
1. Decrese system over head due to reducing a sio H/W interruption.
(H/W interruption is required big cpu time especially latest cpu)
2. For ISDN TA that doen's has a own H/W compression can get double
speed with not compression data. ( i.e. 38400bps -> 7KB/sec )
Atsushi.
--
Atsushi Murai E-Mail: amurai@spec.co.jp
SPEC Voice : +81-3-3833-5341
System Planning and Engineering Corp.
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