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 It would seem you need to look at your radio's and modems first, there must be something wrong. 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. 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. > > Well, I don't know which other information is important to tell? > Any comments about this? Why the stations have long times without > transmiting (max time without tx = 35secs)? > > 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] > -- Regards Richard. [EMAIL PROTECTED]
