From: John Heffner <[EMAIL PROTECTED]> Date: Tue, 04 Dec 2007 13:42:41 -0500
> Ilpo Järvinen wrote: > > ...I'm still to figure out why tcp_cwnd_down uses snd_ssthresh/2 > > as lower bound even though the ssthresh was already halved, > > so snd_ssthresh should suffice. > > I remember this coming up at least once before, so it's probably worth a > comment in the code. Rate-halving attempts to actually reduce cwnd to > half the delivered window. Here, cwnd/4 (ssthresh/2) is a lower bound > on how far rate-halving can reduce cwnd. See the "Bounding Parameters" > section of <http://www.psc.edu/networking/papers/FACKnotes/current/>. I assume we're talking about the tcp_cwnd_min() usage in tcp_cwnd_down(), I don't see where it's dividing by two there. Anyways, someone please enlighten me and please also cook up a patch to add the descriptive comment :-) Thanks! -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
