[Iftop-users] CPU use bug?

[Paul Warren]

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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