Re: network performance problem

Hi,


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?


Greetings


Am 18.09.2006, 15:52 Uhr, schrieb Robert Watson <rwatson@xxxxxxxxxxx>:


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
--
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