Re: ixg(4) performances

[Stephan <stephanwib%googlemail.com@localhost>]

I saw these ping latencys of 0,5 seconds on very different NetBSD
Servers with completely different hardware. There might be a
regression somewhere. I don´t know, if so, wheather it is specific to
ICMP or networking in general.

2014-07-17 6:19 GMT+02:00 Emmanuel Dreyfus <manu%netbsd.org@localhost>:
> Emmanuel Dreyfus <manu%netbsd.org@localhost> 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
> manu%netbsd.org@localhost