Date: Tue, 15 Dec 1998 00:23:00 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: "Jonathan M. Bresler" <jmb@FreeBSD.ORG> Cc: johan@granlund.nu, julian@whistle.com, lars@akerlings.t.se, current@FreeBSD.ORG, isdn@FreeBSD.ORG Subject: Re: if_sppp is BROKEN!!! Message-ID: <6841.913677780@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 14 Dec 1998 15:07:41 PST." <199812142307.PAA27390@hub.freebsd.org>
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In message <199812142307.PAA27390@hub.freebsd.org>, "Jonathan M. Bresler" write s: >> Date: Mon, 14 Dec 1998 22:12:29 +0100 (CET) >> From: Johan Granlund <johan@granlund.nu> >> >> This is really interesting! >> One of the concepts i liked in SYSV (ducking for cover) was streams and >> its ability to chain together modules to process a datastream. >> If it's coupled with kld to dynamically load/unload modules i think >> you have something _very_ good. >> >> That network thing. Can a module route a package thru different modules >> based on contents and state? > > the idea of streams is wonderful, the realization is costly. each > layer added (or module pushed) slows down processing and hurts > throughput. ritchie developed streams for serial, if i remember > correctly. streams was then applied to networks. there is an RFC > about layering being bad for networking and the relative performance > of NIT vs BPF prove the case. But with that said, there is still something to be said for modular and well defined interfaces. But streams ? No. They were great for async protocols, but they fail badly for packet stuff. -- Poul-Henning Kamp FreeBSD coreteam member phk@FreeBSD.ORG "Real hackers run -current on their laptop." "ttyv0" -- What UNIX calls a $20K state-of-the-art, 3D, hi-res color terminal To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
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