network performance problem

[Ingo]

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 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"