On Thu, 25 Mar 1999, Richard Adams wrote:
> According to Jorge Matias: While burning my CPU.
> >
> > I have 2 Linux machines configured with TCP->AX.25 at 9600.
> > I'm doing several performance comparison tests between DG and VC. My
> > wireless connection is between the two stations has permanently 9+30dB of
> > signal strengh.
> > The test is an FTP connection.
> > Well, with VC I cannot finish any transfer. It does timeout everytime.
> > With Datagram mode I can transfer files but the best transfer rate I
> > achieve is 26bytes/second.
> > What I can see in modems behaviour is that they have long times without
> > transmiting.
>
> Then i would say you or your partner are missing packets.
>
> > I have configured some files in /proc/sys/net/ax25/<interface>/:
> >
> > maximum_packet_length = 64
> > standard_window_size = 7
> > t1_timeout = 40
> > t2_timeout = between 5 and 15
> > (Note: There are only these two stations in the frequency)
> >
> > In command "route" I used irtt=6000ms and window 1728/1792 (216/256 * 8)
>
> I have a 9600 point to point DG-link with a friend, we reach 750Bps, +.
>
> MTU 512
> WINDOW 1888
I'm going to try out those values.
>
> It would seem you need to look at your radio's and modems first, there must
> be something wrong.
I thought about that, but I don't know what to look for.
>
> To test a link i send a series of pings as shown below, dont try my example
> on your link, change the -s to suit your MTU otherwise no packets will be
> returned.
Why are you using 472 bytes instead of a lower/greater value?
>
> pipo# ping -c8 -l7 -s472 -i5 44.137.28.42
> PING 44.137.28.42 (44.137.28.42): 472 data bytes
> 480 bytes from 44.137.28.42: icmp_seq=0 ttl=64 time=4571.4 ms
> 480 bytes from 44.137.28.42: icmp_seq=1 ttl=64 time=5009.5 ms
> 480 bytes from 44.137.28.42: icmp_seq=2 ttl=64 time=5447.6 ms
> 480 bytes from 44.137.28.42: icmp_seq=3 ttl=64 time=5885.8 ms
> 480 bytes from 44.137.28.42: icmp_seq=4 ttl=64 time=6324.0 ms
> 480 bytes from 44.137.28.42: icmp_seq=5 ttl=64 time=6762.3 ms
> 480 bytes from 44.137.28.42: icmp_seq=6 ttl=64 time=7200.6 ms
> 480 bytes from 44.137.28.42: icmp_seq=7 ttl=64 time=7638.7 ms
>
> --- 44.137.28.42 ping statistics ---
> 8 packets transmitted, 8 packets received, 0% packet loss
> round-trip min/avg/max = 4571.4/6104.9/7638.7 ms
>
> Repeat that several times, then you can get a good idea how the link is.
Thanks. I'm try this out.
Regards,
Jorge Matias
- -- --- ------------------------------------------------- --- -- -
Computer Science Student at Instituto Superior Tecnico (Lisbon)
A3000/060 32Mb -[Ariadne][MFC III][CV64]- LinuxOS 2.0.36
QRZ: CT2HBZ - E-Mail: [EMAIL PROTECTED]
