Re: [patch] bug fix & TCP networking performance improvements

[David Young <dyoung%pobox.com@localhost>]

On Wed, Apr 20, 2011 at 01:57:09PM +0200, Matthias Drochner wrote:
> 
> tls%panix.com@localhost said:
> > I don't see any such change in our patch.  Could you point it out?
> 
> Here (in your devel-vtw-diff1 file):
> 
> @@ -3231,9 +3492,9 @@ tcp_xmit_timer(struct tcpcb *tp, uint32_
>                  * an alpha of .875 (srtt = rtt/8 + srtt*7/8 in fixed
>                  * point).  Adjust rtt to origin 0.
>                  */
> -               delta = (rtt << 2) - (tp->t_srtt >> TCP_RTT_SHIFT);
> +               delta = (rtt << 0) - (tp->t_srtt >> TCP_RTT_SHIFT);
>                 if ((tp->t_srtt += delta) <= 0)
> -                       tp->t_srtt = 1 << 2;
> +                       tp->t_srtt = 1; // 1 << 2;
>                 /*
>                  * We accumulate a smoothed rtt variance (actually, a
>                  * smoothed mean difference), then set the retransmit

I have committed vestigial time-wait and maximum segment lifetime
truncation.  I left the RTT changes out.  Do people agree that the
changes are correct?

Dave

-- 
David Young             OJC Technologies
dyoung%ojctech.com@localhost      Urbana, IL * (217) 344-0444 x24