Date: Thu, 21 Sep 2023 21:25:38 +0200 From: "M. Mader" <mma@darktemple.ch> To: freebsd-net@freebsd.org Subject: Re: openvpn and no buffer space available (13.2-stable) Message-ID: <03637CE3-1FA4-4900-AFCE-3D2AE8AE5DD5@darktemple.ch> In-Reply-To: <ZQyIgukcwuHbAhLr@int21h> References: <ZQyIgukcwuHbAhLr@int21h>
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Am 21. September 2023 20:16:34 MESZ schrieb void <void@f-m.fm>: >Hello @net, > >tl;dr : is there anything specific to freebsd that needs to be set >in order for openvpn to perform well? What buffer space is ping >complaining about? > >context is recent 13.2 stable, on amd64, and it's a bhyve guest. >The openvpn client uses UDP, on tun0. > >The problem is that when the connection becomes heavily >used, the client end finds that sites that would normally >immediately load often wont; one has to sit there clicking >multiple times to get any site to load. > >ping shows this: > >64 bytes from 93.184.216.34: icmp_seq=37 ttl=53 time=147.407 ms >ping: sendto: No buffer space available >64 bytes from 93.184.216.34: icmp_seq=40 ttl=53 time=174.738 ms >64 bytes from 93.184.216.34: icmp_seq=41 ttl=53 time=119.048 ms >64 bytes from 93.184.216.34: icmp_seq=42 ttl=53 time=169.223 ms >ping: sendto: No buffer space available >64 bytes from 93.184.216.34: icmp_seq=44 ttl=53 time=183.493 ms >64 bytes from 93.184.216.34: icmp_seq=45 ttl=53 time=162.594 ms >^C >--- example.org ping statistics --- >46 packets transmitted, 36 packets received, 21.7% packet loss >round-trip min/avg/max/stddev = 118.258/156.360/184.931/19.508 ms > >I've ran mtu-test on the client, which gives these results > >Empirical MTU test completed [Tried,Actual] local->remote=[1455,1455] remote->local=[1427,1427] > >in /etc/sysctl.conf, I've changed these values: > >net.inet.udp.recvspace=524288 >kern.ipc.shm_use_phys=1 >net.inet.tcp.sendspace=524288 >net.inet.tcp.recvspace=524288 >net.inet.tcp.rfc1323=1 >net.inet.tcp.always_keepalive=0 >kern.ipc.soacceptqueue=524288 > >in /boot/loader.conf, these: > >kern.maxusers="4096" >vm.vnode_pbufs="10240" >kern.ipc.nmbclusters="5000000" > >tia, I run OpenVPN without any such problems. My sysctl.conf as well as my loader.conf are pretty much default. I'd try what happens without vm.vnode_pbufs="10240" Regards, Mathias
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