netdev - Re: debugging TCP stalls on high-speed wifi

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: <ef348261c1edd9892b09ed017a59be23aa2be688.camel@sipsolutions.net>
Date:   Fri, 24 Jan 2020 11:34:31 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     Krishna Chaitanya <chaitanya.mgit@...il.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>
Subject: Re: debugging TCP stalls on high-speed wifi

On Fri, 2019-12-13 at 14:40 +0530, Krishna Chaitanya wrote:
> 
> Maybe try 'reno' instead of 'cubic' to see if congestion control is
> being too careful?

I played around with this a bit now, but apart from a few outliers, the
congestion control algorithm doesn't have much effect. The outliers are

 * vegas with ~120 Mbps
 * nv with ~300 Mbps
 * cdg with ~600 Mbps

All the others from my list (reno cubic bbr bic cdg dctcp highspeed htcp
hybla illinois lp nv scalable vegas veno westwood yeah) are within 50
Mbps or so from each other (around 1.45Gbps).

johannes