netdev - Re: [PATCH] tcp: sysctl for initial receive window

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Message-ID: <1348241111.2669.580.camel@edumazet-glaptop>
Date:	Fri, 21 Sep 2012 17:25:11 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	netdev@...r.kernel.org, Nandita Dukkipati <nanditad@...gle.com>
Subject: Re: [PATCH] tcp: sysctl for initial receive window

On Fri, 2012-09-21 at 10:55 +0200, Jesper Dangaard Brouer wrote:
> Make it possible to adjust the TCP default initial advertised receive
> window, via sysctl /proc/sys/net/ipv4/tcp_init_recv_window.
> 
> The window size is this value multiplied by the MSS of the connection.
> The default value is (still) 10, as descibed in commit 356f039822b
> (TCP: increase default initial receive window.)
> 
> Allow minimum value of 1, but recommend against setting value below 2
> in the documentation.
> 
> Its possible to control/override this value per route table entry via
> the iproute2 option initrwnd.  Having the global default exported via
> sysctl, helps determine the default setting, and make is easier to
> adjust.

I was wondering why its not symmetric :

If we add a sysctl for initial receive window, we need another one for
initial send window ?

Thanks


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