Date: Tue, 30 Mar 2021 17:27:02 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 254333] [tcp] sysctl net.inet.tcp.hostcache.list hangs Message-ID: <bug-254333-7501-2YzHU6qSJL@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-254333-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-254333-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254333 --- Comment #16 from Michael Tuexen <tuexen@freebsd.org> --- Please note that you should not be able to set the net.inet.tcp.hostcache.cachelimit too high. It is set automatically to net.inet.tcp.hostcache.bucketlimit * net.inet.tcp.hostcache.hashsize and you should only the able to reduce it. If you provide a larger value in /boot/loader.conf, the setting should be ignored and the above default should be used. The setting you show indicates that you set net.inet.tcp.hostcache.hashsize to 65536, leave net.inet.tcp.hostcache.bucketlimit at the default of 30, and the net.inet.tcp.hostcache.cachelimit is set automatically. However, net.inet.tcp.hostcache.count should always be between 0 (inclusive) and net.inet.tcp.hostcache.cachelimit (inclusive). So I would really like to understand how you end up with such a large net.inet.tcp.hostcache.count. This really blows up the sysctl operation, since the code wants to allocate linesize * (V_tcp_hostcache.cache_count + 1) bytes, which is much higher than the limit Richard computed... -- You are receiving this mail because: You are on the CC list for the bug.
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