netdev - Re: [PATCH net-2.6 0/3]: Three TCP fixes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <47559FA1.2090104@psc.edu>
Date:	Tue, 04 Dec 2007 13:42:41 -0500
From:	John Heffner <jheffner@....edu>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-2.6 0/3]: Three TCP fixes

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/>.

   -John
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html