netdev - Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility workaround

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Date:	Mon, 25 Aug 2008 18:45:40 +0200
From:	Thomas Jarosch <thomas.jarosch@...ra2net.com>
To:	Netdev <netdev@...r.kernel.org>
Cc:	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility workaround

Forward mail. Upgrading to KDE 4.1.0/kdepim4 from KDE 3.5.9
enabled HTML emails by default and I didn't notice it before.

----------  Forwarded Message  ----------

Subject: Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility workaround
Date: Monday, 25. August 2008
From: Thomas Jarosch <thomas.jarosch@...ra2net.com>
To: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>

On Friday, 22. August 2008 23:18:44 Ilpo Järvinen wrote:
> In the meantime, can you check the attached patches. Besides the kernel
> patch, you need to build your own patched iproute2 as well to configure
> the features (ip tool among them is enough in case the build of some other
> part of the toolset fails like it did for me). I somewhat tested them, and
> the result seemed to be what I'd expect (I just forced RTOs with some
> netem heavy dropping and quickly glanced over the resulting packet
> patterns near RTO).

Your patches work fine.

I've noticed two small things:
1. Maybe it's a good idea to add a note above the tcp_use_frto() change
to explain that the value is negated. Took me a while to figure out
why there is no "!" in there :-)
2. Maybe rename the "features" option in iproute2 to "disable_features".
Then it would be more intuitive what it does.

btw: If you apply something to the iproute2 git tree,
I got a compiler error while testing the patch:

In file included from lnstat.c:40:
lnstat.h:28: error: field 'last_read' has incomplete type
lnstat.h:29: error: field 'interval' has incomplete type

Attached small patch fixes the issue.

Cheers,
Thomas

View attachment "iproute2-fix-include-for-timeval.patch" of type "text/x-patch" (553 bytes)