network performance problem

[Ingo]

OpenBSD uses on sis0 MTU=1500
and lo0= MTU=33224


Am 18.09.2006, 20:56 Uhr, schrieb Robert Watson <rwatson at FreeBSD.org>:

> 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
>>>> --
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>>