Date: Fri, 28 Jun 2019 13:44:44 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 238741] RACK tcpip stack causes connections to hang Message-ID: <bug-238741-7501-6L4qvQ28uY@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-238741-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-238741-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D238741 --- Comment #1 from adrik@salesmanager.nl --- I think the problem might be related to the selected TCP Congestion Control algorithm. If I select Cdg as the TCP Congestion Control algorithm: # kldload cc_cdg # sysctl net.inet.tcp.cc.algorithm=3Dcdg Tcp connections will sometimes hang and finally timeout. When this happens, the socket Send-Q is not empty and will never drain, so = some or all data is never sent. # netstat -6n Active Internet connections Proto Recv-Q Send-Q Local Address Foreign Address (state) tcp6 0 383 2a02:xxxx:yyy:18.56748 2a04:4e42:9::729.443 ESTABLISH= ED The same happens with IPv4 and IPv6 connections. If I change the TCP Congestion Control to any other algorithm, the problem doesn't exist anymore. I did a quick test with NewReno, Cubic, HTcp and Chd as the selected TCP Congestion Control algorithm and all work. --=20 You are receiving this mail because: You are the assignee for the bug.=
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