gobby uses 100% CPU on files >500KB in size

[Rolf Leggewie]

Upstreams devs verified that gobby eats up a lot of CPU when trying to collaborate on a rather large text file (in my case it was just shy of 1MB). After about a minute, the session connection was severed. gobby continued to use 100% of CPU, never recovered, became unresponsive and had to be killed with "killall gobby".

Upstream devs quickly provided a patch in 5d3d8c71645b5bfb27b7538b3c3c4ebef1117cf3 which I attach here. I recompiled the hardy package with that patch and can happily report that indeed this fixes the problem. I recommend to release an updated package including that patch.

[Philipp Kern (pkern)]

Steps to reproduce the problem:

 * Install `gobby'.
 * Start a Gobby server somewhere (localhost might also be possible)
 * Connect with another Gobby client.
 * Open a big text(!) file with many newlines, colons and/or slashes (those are the characters that are escaped). In the tests it was a 1Mb file.
 * Watch the GUI freeze while Gobby does many, many memmoves while escaping the outgoing packet.

[Scott Kitterman (kitterman)]

<pitti> ScottK: haven't thorougly read the patch, but size and shape-wise it looks ok to me

[Martin Pitt (pitti)]

Accepted into -proposed, please test and give feedback here. Please see https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

[Rolf Leggewie (r0lf)]

As usual, I can't find the darn thing in -proposed. I don't want to enable -proposed globally. I suggest to update the above wiki page with some instructions on how to locate a single package in -proposed for download and installation with wget and dpkg -i

[Martin Pitt (pitti)]

Hi Rolf,

Rolf Leggewie [2008-07-25 10:45 -0000]:
> As usual, I can't find the darn thing in -proposed. I don't want to
> enable -proposed globally. I suggest to update the above wiki page with
> some instructions on how to locate a single package in -proposed for
> download and installation with wget and dpkg -i

For this update you want the "libnet6-1.3-0" package (built by the
net6 source).

[Scott Kitterman (kitterman)]

The package has to be built, published, and then make it to your mirror.
As of a minute ago when I checked, the binaries weren't published yet. If
you check, a particular architecture, it needs to be marked DONE before
it's available. See:

launchpad.net/ubuntu/hardy/+source/net6/1:1.3.6-1ubuntu0.1

[Rolf Leggewie (r0lf)]

I am happy to report that http://launchpadlibrarian.net/16297620/libnet6-1.3-0_1.3.6-1ubuntu0.1_i386.deb does indeed fix the problem

[Martin Pitt (pitti)]

Copied to hardy-updates.