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Date:      Thu, 17 Jan 2008 00:21:02 +0200
From:      Alexander Motin <mav@FreeBSD.org>
To:        Michael MacLeod <mikemacleod@gmail.com>
Cc:        freebsd-net@freebsd.org, Julian Elischer <julian@elischer.org>, Nikos Vassiliadis <nvass@teledomenet.gr>
Subject:   Re: Multilink PPP Download Speeds With Round-Robin Packets
Message-ID:  <478E834E.4080302@FreeBSD.org>
In-Reply-To: <1200518607.00010486.1200507002@10.7.7.3>
References:  <1200479046.00010232.1200466203@10.7.7.3> <1200479105.00010249.1200468002@10.7.7.3> <1200482587.00010258.1200469801@10.7.7.3> <1200489793.00010290.1200478201@10.7.7.3> <1200518607.00010486.1200507002@10.7.7.3>

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Michael MacLeod wrote:
> So there are lots of out of order packets, but that's to be expected
> with round-robin multilink ppp. I ran these after downloading three
> copies of the linux kernel in parallel, and there are no packets that
> were reassembled.

Even working in round-robin mode ppp avoids packet reordering as it may 
lead to problems with compression/encryption protocols. Multilink header 
includes serial number especially for this purpose.

> I seem to recall that mpd did not support either
> packet splitting or round-robin (I forget which, and I forget where I
> read it), and since my connection to TekSavvy uses both of these, it
> might be a non-starter.

Mpd supports both. There were some mistakes in multilink transmission 
part of ng_ppp kernel module working in splitting mode that in some 
cases could lead to ineffective packet distribution, but they were fixed 
8 months ago at 6-STABLE.

-- 
Alexander Motin



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