Hi Paul,
Not a ton of traffic, tens or hundreds of kbps... it doesn't seem to depend on this. The highest typical amount would be 10-50Mbps, or occasionally up near 1Gbps on 1 of the faulty machines. It definitely seems NIC/driver-dependent, though, as I tried a wifi dongle on one of the bad machines and the problem didn't present itself on that interface. And as I mentioned, it has worked in the past on the same hardware.
Alex
On 11/12/2013 05:24 AM, Paul Warren wrote:
Hi Alex,
Apologies for the delay in replying to this.
How much traffic is being seen on the machines involved?
Paul
On 02/11/2013 12:05, Alex Page wrote:
Hello, I am seeing strange behavior recently in iftop on Ubuntu (x64, 12.04 and 13.10). With Port Display disabled, iftop simply uses more CPU than normal (say, 20% instead of a negligible amount). Then, when Port Display is enabled, CPU use goes straight to 100% and iftop becomes unresponsive.
This behavior started sometime in the last few months, and occurs on 2 of the 4 Ubuntu machines that I've tested it on. I compiled iftop 0.17 and 1.0-pre2 from source and observed the same behavior as the precompiled version (1.0-pre2 from the Ubuntu repo) on these computers.
I cannot figure out what is unique (other than physical hardware) about the 2 machines that still work, except that they use 3.2 and 3.6 kernels (vs. 3.5 and 3.11 on the machines that don't work). So maybe there's a network driver issue? I checked the version numbers of libc6, libncurses, libpcap, and libtinfo (all the dependencies I know of) and they are the same on 1 of the working machines vs. 1 of the non-working ones. And iftop worked properly on all of these machines until some relatively recent update.
So, iftop is completely unusable on at least 2 of my computers. Can anyone recommend further troubleshooting steps that I could take to isolate this problem, preferably without rebooting? Are there any other library versions I should check?
Thanks, Alex
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