Date: Mon, 12 Jun 1995 19:50:50 -0700 (PDT) From: Tom Samplonius <tom@uniserve.com> To: Atsushi Murai <amurai@spec.co.jp> Cc: current@FreeBSD.ORG Subject: Re: GENERIC kernel & some basic UNIX pointers Message-ID: <Pine.BSF.3.91.950612194519.16318B-100000@haven.uniserve.com> In-Reply-To: <9506130247.AA00039@tama3.spec.co.jp.spec.co.jp>
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On Tue, 13 Jun 1995, Atsushi Murai wrote: > 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) What about the extra CPU time and extra latency required for the actual compression? > 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 ) I've looked at this application myself. Especially over 56k or 64k links. However, dedicated units still provide better performance (ex. Gandalf 5250i with "advertised" compression up to 8:1, and in reality isn't as much, but is still very good). Tom
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