Re: Possible BUG in IPv4 TCP window handling, all recent 2.4.x/2.6.x kernels

[John Heffner]

On Sep 2, 2005, at 9:48 AM, Alexey Kuznetsov wrote:

> Hello!
>
> > If you overflow the socket's memory bound, it ends up calling
> > tcp_clamp_window().  (I'm not sure this is really the right thing to 
> > do
> > here before trying to collapse the queue.)
>
> Collapsing is too expensive procedure, it is rather an emergency 
> measure.
> So, tcp collapses queue, when it is necessary, but it must reduce 
> window
> as well.

Right.

I wonder if clamping the window though is too harsh.  Maybe just 
setting the rcv_ssthresh down is better?  Why the distinction between 
in-order and out-of-order data?  Because you expect in-order data to be 
a persistent case?

  -John

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