Emmanuel Dreyfus <m...@netbsd.org> wrote: > I experiment 10 GE link with ixb(4), but the result is really weak: The > two machines have a direct link through a SFTP+ câble, and copying a file > over NFS I get a throughput of 1.8 Mb/s, which is less than 2% of the > link capacity. Any idea of where to look for imrovement?
I measured TCP performance with netperf and I was able to increase throughput up to 2.2 Gb/s using the following settings: ifconfig ixb0 mtu 9000 tso4 ip4csum tcp4csum-tx udp4csum-tx sysctl: kern.sbmax = 67108864 kern.somaxkva = 67108864 net.inet.tcp.rfc1323 = 1 net.inet.tcp.sendspace = 2097152 net.inet.tcp.recvspace = 2097152 net.inet.tcp.recvbuf_auto = 0 net.inet.tcp.sendbuf_auto = 0 tcp4csum-rx and udp4csum-rx produces errors despite being advertised by ifconfig capabilities line. I do not find any way to improve further. But there is a very high latency that may be responsible for the problem: PING 10.103.101.113 (10.103.101.113): 48 data bytes 64 bytes from 10.103.101.113: icmp_seq=0 ttl=255 time=0.582 ms 64 bytes from 10.103.101.113: icmp_seq=1 ttl=255 time=0.583 ms 64 bytes from 10.103.101.113: icmp_seq=2 ttl=255 time=0.568 ms 64 bytes from 10.103.101.113: icmp_seq=3 ttl=255 time=0.565 ms This is twice what I get on gregular gigabit ethernet. Any idea of why it is so high? >= 500 ms seems wrong on a 10GE direct link... -- Emmanuel Dreyfus http://hcpnet.free.fr/pubz m...@netbsd.org
