network performance problem

[Robert Watson]

On Mon, 18 Sep 2006, Ingo wrote:

> heres the output of route get 192.168.0.11:
>
> localhost# route get 192.168.0.11
>  route to: 192.168.0.11
> destination: 192.168.0.0
>      mask: 255.255.255.0
> interface: sis0
>     flags: <UP,DONE,CLONING>
> recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu 
> expire
>      0         0         0         0         0         0      1500       -69
>
> I set the lo0 interface as you recommended from 16384 to 1500. Now I have 
> the same thoughput as with the IP (~2.3MB/s).
>
> Shouldn´t FreeBSD recognize, that it is it´s local address, like openbsd 
> does?

What MTU does OpenBSD use on its loopback interface as compared to the 
network interface?

Robert N M Watson
Computer Laboratory
University of Cambridge

>
>
> Greetings
>
>
> Am 18.09.2006, 15:52 Uhr, schrieb Robert Watson <rwatson at FreeBSD.org>:
>
>> 
>> On Wed, 13 Sep 2006, Ingo wrote:
>> 
>>> I`ve some problems with the network performance on my Soekris NET 4801.
>>> (Freebsd 6.1 release-p3)
>>> 
>>> When I start "netio" on the soekris and do a "netio localhost", I get 
>>> about
>>> 8.4 MB/sec, and when I start with "netio 192.168.0.11"(it´s localhost
>>> address) I get only ~2.3 MB/sec. That´s what top says when I do:
>> 
>> What does "route get 192.168.0.11" return?
>> 
>> What happens if you force the localhost MTU from whatever the default is 
>> (most
>> likely 16k) to the same as the ethernet interface?
>> 
>> Robert N M Watson
>> Computer Laboratory
>> University of Cambridge
>> 
>>> 
>>> localhost
>>> CPU states:  2.3% user,  0.0% nice, 72.5% system, 25.2% interrupt,  0.0% 
>>> idle
>>> 
>>> 192.168.0.11
>>> CPU states:  1.2% user,  0.0% nice, 46.3% system, 52.5% interrupt,  0.0% 
>>> idle
>>> 
>>> As you can see, the interrupt load is more than doubled when I use the Ip
>>> address, and
>>> I´ve no idea why.
>>> 
>>> 
>>> Here are some other throughput results of the soekris:
>>> 
>>> openbsd# ftp 192.16.8.0.20	2.0 MB/sec
>>> openbsd# iperf localhost 1.4 Mbit/sec
>>> openbsd# iperf 192.168.0.11(it´s localhost address) 1.4 Mbit/sec
>>> openbsd# netperf localhost 70MB/sec
>>> openbsd# netperf 192.168.0.11(it´s localhost address) 70MB/sec
>>> 
>>> freebsd# ftp 192.168.0.20  2.3 MB/sec
>>> Freebsd# iperf localhost 45 Mbit/sec
>>> Freebsd# iperf 192.168.0.11 (it´s localhost address) 19 Mbit/sec
>>> Freebsd# netperf localhost 67 Mbit/sec
>>> Freebsd# netperf 192.168.0.11 (it´s localhost address) 19 Mbit/sec
>>> 
>>> 
>>> What causes the difference between localhost and the ip address on 
>>> Freebsd?
>>> On Openbsd there is no diffenerce at all.
>>> 
>>> 
>>> Greetings
>>> --
>>> Erstellt mit Operas revolutionärem E-Mail-Modul: 
>>> http://www.opera.com/mail/
>>> _______________________________________________
>>> freebsd-performance at freebsd.org mailing list
>>> http://lists.freebsd.org/mailman/listinfo/freebsd-performance
>>> To unsubscribe, send any mail to
>>> "freebsd-performance-unsubscribe at freebsd.org"
>
>