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-next>] [day] [month] [year] [list]

Message-Id: <80B44318-C66D-4585-BCE3-C926076E8FF8@superduper.net>
Date:   Mon, 16 Dec 2019 10:14:40 -0800
From:   Simon Barber <simon@...erduper.net>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Johannes Berg <johannes@...solutions.net>,
        linux-wireless@...r.kernel.org, ncardwell@...gle.com,
        netdev@...r.kernel.org, toke@...hat.com
Subject: Re: debugging TCP stalls on high-speed wifi

I see Macbook wifi clients seemingly randomly switch in and out of using GRO (I’ve not yet figured out a pattern to it), and the packet rate when they are doing GRO (on a download) is much lower, due to ACKing one in 8 packets instead of every other data packet. This has a big impact on performance.

Simon