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SubjectRe: route cache DoS testing and softirqs
Date
Hello!

> > We had one full solution for this issue not changing anything
> > in scheduler/softirq relationship: to run rcu task for the things
> > sort of dst cache not from process context, but essentially as part
> > of do_softirq(). Simple, stupid and apparently solves new problems
> > which rcu created.
>
> Can you be a little bit more specific about this solution ?

It is about that your suggestion, which you outlined below :-)

> as indicated by my earlier experiments. We have potential fixes
> for RCU through a call_rcu_bh() interface where completion of a
> softirq handler is a quiescent state. I am working on forward porting
> that old patch from our discussion last year and testing in my
> environment. That should increase the number of quiescent state
> points significantly and hopefully reduce the grace period significantly.
> But this does nothing to help userland starvation.

Alexey
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