Updates using idle bandwidth

[Sunil Ghai]

>I'm not clear on whether the 'throttle' and 'bandwidth' configuration would
>apply to yum-updatesd.  It would still not be a dynamic adjustment but if
users
>knew how this worked it might be a good enough solution.

That would not be the solution in real sense. What if someone wants to
download another important file? A mechanism is needed to stop downloading
the updated packages when the file is being downloaded. When it is done, we
can resume updating the system.

> We have TCP Low Priority¹ congestion algorithm in kernel. yum-updatesd
>should request it on downloading socket via setsockopt(), as per commit
>bc0efe7b46174fa3cadf00ac64e4a751cc4619fd .

This might help me. Could you please provide me some more pointers?

>One problem I see with this is that bandwidth statistics from are reset
when
>you reboot the machine. Unless you keep the machine up all the time it will
lose track
>of the exact amount of bandwidth used up. Maybe another daemon will need to
keep track of
>this?
We actually don't need this kind of thing. For example, if currently 60% of
the bandwidth is in usage, 40% is idle, we can use this idle bandwidth to
download updated packages.Once the list of updated packages has been
prepared, we can start downloading them and if the user shuts down the
machine, next time we can resume downloading the packages where we left off.
In this way user would never feel that the system is actually being updated,
he or she will just get the message that "The system has been updated.."

Problem is this requires server support from where the packages are coming.
Each repository server would require to support asynchronous file
transfer..I am doubtful here..
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