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Re: [PATCH] unclamp tcp receive window if doing dynamic receive sizing

To: Stephen Hemminger <shemminger@xxxxxxxx>
Subject: Re: [PATCH] unclamp tcp receive window if doing dynamic receive sizing
From: "David S. Miller" <davem@xxxxxxxxxx>
Date: Mon, 7 Jun 2004 16:17:41 -0700
Cc: netdev@xxxxxxxxxxx
In-reply-to: <20040607133056.5ab9e72d@xxxxxxxxxxxxxxxxxxxxx>
References: <20040607133056.5ab9e72d@xxxxxxxxxxxxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
On Mon, 7 Jun 2004 13:30:56 -0700
Stephen Hemminger <shemminger@xxxxxxxx> wrote:

> When running tests over higher speed links, the new 2.6 Dynamic Receiver 
> Sizing
> code doesn't increase the window large enough.  The problem is that the window
> clamp restricts the allowed window to the socket receive buffer size (85k)
> 
> Easiest fix is to not restrict window clamp if we want to dynamic receiver 
> stuff.
> This is what web100 did.
> 
> Thanks to John Heffner for finding this.

This turns off all tcp_app_win semantics, are you sure that
tcp_app_win makes no sense when doing dynamic receive buffer
sizing?  I think we should still factor it in, perhaps dynamically,
during rcvbuf growth.


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