Re: [Duplicity-talk] How to set network priority

[Tapio Sokura]

Hello,

If you want both a) to utilize all the bandwidth you have available and 
b) to not let the backup hog all bandwidth if other machines want it 
too, the place you need to do it is in a device that sees all the 
traffic in/out of your network. If the home network/internet router you 
have can't do it, you need another box. Any purely host-based QoS 
solution doesn't know what other hosts in the network are doing so you 
end up not using the total bandwidth efficiently.

My experience with setting different kind of QoS priority bit values in 
~home gear have not been too good. The problem is at least two-fold, you 
need the host with higher or lower priority traffic to mark the packets, 
and you need the network router to prioritize based on that. The network 
router also needs to know what's the actual usable capacity of the 
upstream link.

Most success I've had with routers where I can enter actualy bandwidth 
numbers and divide traffic into priority classes based on what 
machines/ports they come/go. For example Linux has had these features in 
the kernel for 20 years, but it's a completely different thing which 
home router manufacturers actually expose you useful access to these 
features. Some just do something to put the QoS label on the marketing 
material without it actually being useful.

  Tapio

On 10.9.2021 20:15, Andy Hairston via Duplicity-talk wrote:
> I tried using trickle. It has the same effect as limiting the bandwidth for
> that entire machine. ionice seems to be for setting local I/O priority.
>
> I'm looking for a way to give the traffic from other machines on my network
> priority over Duplicity (or the machine Duplicity is running on). That way
> Duplicity can use the full bandwidth when other devices don't need it (ex.
> 4 AM) but not choke out other traffic. Which is why I tried QoS settings on
> router, and setting DSCP priority.
>
> Any ideas?
>
> On Fri, Sep 10, 2021, 11:46 AM Kenneth Loafman <kenneth@loafman.com> wrote:
>
> > Hi,
> >
> > Duplicity does not have an option to set IO priority, however, if you run
> > ionice <http://manpages.ubuntu.com/manpages/bionic/en/man1/ionice.1.html>,
> > you should get what you need.
> >
> > Another option would be trickle
> > <http://manpages.ubuntu.com/manpages/bionic/man1/trickle.1.html>.  It
> > deals with bandwidth shaping.
> >
> > Google searches yield a lot of answers to your question.
> >
> > ...Ken
> >
> >
> > On Thu, Sep 9, 2021 at 11:17 AM Andy Hairston via Duplicity-talk <
> > duplicity-talk@nongnu.org> wrote:
> >
> > > I'm using Duplicity under CentOS 7 to back up to Backblaze B2, running
> > > from my home network. Due to the size of my backup and my comparatively
> > > slow upload speed (1.8 Mbps), it takes several weeks to run a full backup.
> > > If I let it run unthrottled, it hogs all the bandwidth - all other devices
> > > on my network have difficulty connecting to outside websites, etc.
> > >
> > > On my router (Asus RT-ACRH17), I tried setting outgoing traffic from that
> > > machine to lowest priority, but apparently the router's QoS isn't actually
> > > functional; all the combinations of settings I've tried (including those
> > > provided by Asus support) have no effect whatsoever.
> > >
> > > I've also tried using iptables to set the DSCP priority to CS1. This
> > > doesn't seem to have any effect either, though I did confirm (on the CentOS
> > > machine) that the priority is being set.
> > >
> > > For the moment, I've used my router settings (Bandwidth Limiter instead
> > > of proper QoS) to throttle that particular computer down to 1.4 Mbps
> > > maximum. Two downsides - this increases how long the backup takes, and if
> > > other devices need more than 0.4 Mbps total then they get bogged down again.
> > >
> > > Is there a way of setting the *network* (not processor) priority for
> > > Duplicity to "lowest", so all other traffic gets to go first? Does this
> > > require something specific in the router to get it to work?
> > >
> > > albegadeep
> > > _______________________________________________
> > > Duplicity-talk mailing list
> > > Duplicity-talk@nongnu.org
> > > https://lists.nongnu.org/mailman/listinfo/duplicity-talk
>
>
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