Date: Mon, 12 Oct 1998 12:38:44 +0900 From: Kenjiro Cho <kjc@csl.sony.co.jp> To: Brian Somers <brian@Awfulhak.org> Cc: current@FreeBSD.ORG Subject: Re: Improper sharing of modem bandwidth Message-ID: <199810120338.MAA07249@hotaka.csl.sony.co.jp> In-Reply-To: Your message of "Fri, 09 Oct 1998 10:58:48 %2B0100." <199810090958.KAA00774@woof.lan.awfulhak.org>
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Brian, How hard do you think it is to add the following feature to the userland ppp? The issll working group at IETF (http://www.ietf.org/html.charters/issll-charter.html) proposes a suspend/resume style transmission method: "PPP in a real-time oriented HDLC-like framing". (http://www.ietf.org/internet-drafts/draft-ietf-issll-isslow-rtf-03.txt) The basic idea is that, if a FIFO based serial chip is used, we are able to control the transmission of each byte so that we can suspend a low-priority packet in the middle of the transmission. In the above draft, the frame format and the negotiation format is defined as an extension to the PPP Multilink fragmentation protocol. With the packet-by-packet control, the latency is more than 500 ms over 64Kbps with 1500-byte MTU. I believe that the latency of telnet will be less than 50 ms even in the middle of ftp, if the suspend/resume is implemented. --Kenjiro To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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