Date: Thu, 23 Apr 1998 23:34:34 +0100 (BST) From: Andrew Gordon <arg@arg1.demon.co.uk> To: Hellmuth Michaelis <hm@kts.org> Cc: freebsd-isdn@FreeBSD.ORG Subject: Re: VJ-comp on raw interfaces in I4B? Message-ID: <Pine.BSF.3.91.980423231940.5259B-300000@server.arg.sj.co.uk> In-Reply-To: <m0yR8IU-00024UC@bert.kts.org>
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This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mime@docserver.cac.washington.edu for more info. --0-1521551382-893370874=:5259 Content-Type: TEXT/PLAIN; charset=US-ASCII Here are the patches to the ipr driver and manpage to implement VJ compression, based on the way it was done in bisdn. A few notes: 1) I have put all the code inside #ifdef IPR_VJ, similar to how it was in bisdn, but I would have thought that it was sufficiently small and low-overhead that it could just be included without ifdefs. 2) The bisdn version went to some trouble over retaining the uncompressed version of outbound packets, in order to pass them to BPF. I have avoided this by simply reversing the order of a couple of lines of code (and it appears to work), but maybe there was some reason the old code took the more complicated approach? 3) I have had to move the byte-counting on outbound traffic in order that it counts the size of packets before compression. This means that the bytes are counted slightly too early (ie. when packets enter the Tx queue, rather than when they are actually transmitted), but this seems more useful than recording the compressed size - there is already a separate counter for the B-channel byte count. --0-1521551382-893370874=:5259 Content-Type: TEXT/PLAIN; charset=US-ASCII; name=diff1 Content-Transfer-Encoding: BASE64 Content-ID: <Pine.BSF.3.91.980423233434.5259C@server.arg.sj.co.uk> Content-Description: KioqIGk0Yl9pcHIuYy5vcmlnCVRodSBBcHIgMjMgMTY6MzA6MzMgMTk5OA0K LS0tIGk0Yl9pcHIuYwlUaHUgQXByIDIzIDIwOjI5OjU2IDE5OTgNCioqKioq KioqKioqKioqKg0KKioqIDc0LDc5ICoqKioNCi0tLSA3NCw4NSAtLS0tDQog ICNpbmNsdWRlIDxuZXRpbmV0L2luX3Zhci5oPg0KICAjaW5jbHVkZSA8bmV0 aW5ldC9pcC5oPg0KICANCisgI2lmZGVmIElQUl9WSg0KKyAjaW5jbHVkZSA8 bmV0L3NsY29tcHJlc3MuaD4gICAgICAgDQorICNkZWZpbmUgSVBSX0NPTVBS RVNTIElGRl9MSU5LMCAgLyogY29tcHJlc3MgVENQIHRyYWZmaWMgKi8NCisg I2RlZmluZSBJUFJfQVVUT0NPTVAgSUZGX0xJTksxICAvKiBhdXRvLWVuYWJs 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