On Wed, Mar 11, 2009 at 11:35:15AM +0100, Bengt Gördén wrote: > > Anyone an idea as to what is happening here, > > and how it could be cured ? > > I can't say that I can help you but 19 years as a network engineer can come > in > handy. > > The most obvious is that the network is overloaded in some way. Doesn't need > to be in terms of bandwidth. It can be things like spanning-tree going > heywire in switches. Redirects is another thing that comes to my mind. A > sophisticated (there are things like slow pings of IPv6 addresses that fills > up the table in a switch) DoS might also be the case. > > If we assume it's the network that causes the problem you obviously have the > switches and the routers that can cause the problems not to say firewalls. > What network set up (equipment and such) do you have? > > Is the network protected in some way?
I'll make a complete list of all the equipment next monday (I don't return there before). The network is completely isolated, there are just the four WFS computers (and a fifth which was not being used), and my Thinkpad R51. Apart from the ssh -X connection the only traffic are the messages I mentioned before (around 50/s) and the status reports from the slave computers, around 60/s for all three added. All messages are less than an MTU. > Have you made some performance tests? iperf is handy. > > TCP: > server:> iperf -s > client:> iperf -c server > > UDP: > server:> iperf -su > client:> iperf -c server -u Good tip, will do. Now you're here you may be able to comment on another problem: the network adapter in the master does not receive the multicast messages it is sending (even if the TX socket has the IP_MULTICAST_LOOP option set). Chip is Intel 85something, driver e1000e. Many thanks, -- FA Laboratorio di Acustica ed Elettroacustica Parma, Italia Be quiet, Master Land; and you, Professor, will you be so good as to listen to me ? _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev
