DragonFly users List (threaded) for 2005-04
Re: DP performance
--- Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
> :A machine running 1.2 with one or two opterons
> :goes into livelock at just about the same
> :level, which is about the same behavior as
> :older freeBSD versions. Are such things still
> :work in progress?
> The network path is still operating under
> the big giant lock.
> We expect to get it out from under the BGL
> this year.
> Could you explain the characteristics of
> the livelock you
> are observing ? Interrupt layer livelock
> shouldn't happen
> with a modern network adapter, but it is
> certainly possible
> that other forms of livelock are effecting
> the system. The
> biggest single problem is still the BGL but
> I am also rather
> unhappy with our current scheduler.
I wonder why/how you say that? Interrupt livelock
has always been a way of life with FreeBSD 4.Its
fairly easy to reach while bridging with a large
number of firewall rules with an fxp or em
Just increase the rate until you lose the
keyboard. What is your idea of a "modern"
Is there a way to direct specific interrupt
activity to a single processor, or to tune the
behaviours in any way? It seems absurd that there
is no networking benefit to adding another
processor two years into the project.
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