Bug#302313: 100% CPU in combination with trickle (B/W shaping)
Package: apt
Version: 0.5.28.1
Hello,
since I'm currently still using a 56K connection, I wanted to employ
user-space bandwidth shaping to have lower download rates for certain
processes.
I discovered that this works nicely using wget, but using apt, it also
works (nicely shaped at 2KB/s), yet both its ftp and http methods use
as much CPU power as they can get.
This is with trickle version 1.07-3, in a setup that's NOT using trickled
(the daemon).
A sample cmdline used is
trickle -d 2 apt-get install evolution
Since both wget (1.9.1-8) and curl (7.13.1-2) manage to work nicely
without a CPU busy loop (wget -c ftp://ftp.de.debian.org/pub/debian/ls-lR),
I'd assume this to be a fatal issue in apt's http/ftp methods' socket event
loop or so.
Together with bugs #146877, #156578, #179384, #240417 and #270869 which all
would like to see bandwidth limiting within apt itself, this is cause
for concern since not even with non-native solutions limiting works properly
(apart from kernel-space shaping, which does work but cannot easily employ
per-process settings).
These are package versions on a testing test setup, but the same issue
also happens equally with newer versions of all these packages
in my Debian unstable machine (which I currently cannot access).
Thank you for an outstanding package management mechanism!
Andreas Mohr
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