Updates using idle bandwidth

[Tomasz Torcz]

Dnia 11-03-2008, wto o godzinie 20:48 -0400, Sunil Ghai pisze:
> Hi,
> 
> Rather than implementing dynamic bandwidth throttling feature in
> updates only, how about having a framework possibly in form of headers
> and libraries which would implement dynamic throttling and other
> applications like Package manager or Firefox would be able to use it.
> For example, we can add one option in wget to get files using idle
> bandwidth only. This will solve purpose for other applications also. 

  I write second time about TCP Low Priority. It's a congestion control
algorithm included in Linux kernel. Connections using this algorithm
*should* use only idle bandwidth. In other words, such framework already
exist in form of self-tuning TCP stack.
  Last time I wrote you asked for example code how to use it. Here you
are, in python:

#v+
#!/usr/bin/python

import socket

socket.TCP_CONGESTION = 13

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_CONGESTION, "lp")

#v-

Module tcp_lp.ko will be autoloaded by kernel. So this setsockopt() call
is ready to be put into yum-updatesd, just after socket creation.

-- 
Tomasz Torcz