netdev - Re: [PATCH net-next] tcp: use TCP_DEFAULT_INIT_RCVWND in tcp_fixup

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Message-Id: <20111020.155002.555965434596006787.davem@davemloft.net>
Date:	Thu, 20 Oct 2011 15:50:02 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: use TCP_DEFAULT_INIT_RCVWND in
 tcp_fixup_rcvbuf()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 20 Oct 2011 21:16:26 +0200

> Since commit 356f039822b (TCP: increase default initial receive
> window.), we allow sender to send 10 (TCP_DEFAULT_INIT_RCVWND) segments.
> 
> Change tcp_fixup_rcvbuf() to reflect this change, even if no real change 
> is expected, since sysctl_tcp_rmem[1] = 87380 and this value
> is bigger than tcp_fixup_rcvbuf() computed rcvmem (~23720)
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
 ...
> +	unsigned int mss = min_t(unsigned int, tp->advmss, 1460);

I don't understand where this calculation comes from, and even if it
should be obvious it isn't to me and deserves a mention in the commit
message at a minimum.
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