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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