[Cake] Dropping dropped

Adrian Popescu adriannnpopescu at gmail.com
Fri Feb 15 03:23:17 EST 2019

On Thu, Feb 14, 2019 at 4:35 PM Toke Høiland-Jørgensen <toke at redhat.com>

> Adrian Popescu <adriannnpopescu at gmail.com> writes:
> > Hello,
> >
> > I've taken a look at cake's source code to see what simple changes could
> be
> > made to attempt to speed it up. There seemed to be a per flow variable
> > called dropped which might not be that useful for regular users. The
> > attached patch removes it.
> I appreciate the sentiment; however, we keep a lot of statistics for a
> reason, and we don't want to just drop those. Besides, a single variable
> increment is probably not going to make much difference for performance.

Perhaps this seemed I implied that it was more than an experiment or
something meant to be merged. Is sharing a patch to start a conversation
frowned upon?

The point is that low end routers can't run cake at high speeds. It doesn't
make sense to buy more expensive hardware for home networks.

> > Perhaps cake could be optimized further for slow devices. What's the
> > recommended solution for profiling the kernel on mips with openwrt?
> No doubt; however, I'd suggest going about it by actually measuring any
> bottle-necks and working from there. The 'perf' tool works on openwrt
> these days, I think; that would probably be a good place to start.


> -Toke
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