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xen-users
[Xen-users] Re: [quagga-users 10973] Quagga on Xen - Latency / Bandwidth
On Jul 29, 2009, at 4:04 AM, Robert Dunkley wrote:
I was wondering if anyone is running Quagga on Xen? What is
throughput/latency like?
Was looking for about a gig of mixed packet size BGP throughput.
Presumably you mean internet traffic.
On bare metal (no Xen), that will work fine for mixed Internet
traffic, but you need to think about corner cases. What do you expect
to have happen when you get DDoSed with minimum-size packets? I don't
think even the multiqueue GbE cards will let you handle that, but I
have not tested that, and I'd love to be proven wrong.
I'm also under the impression that Linux 2.6.30 kernels have some
significant patches to make (better?) use of multiqueue cards but I
don't remember the details. Maybe 2.6.30 can distribute ksoftirqd load
over multiple cores? If so that's a big win, as that was the killer
with large PPS when we tested on somewhat less powerful hardware with
an older kernel, and you can probably handle a full gbps of min-sized
packets if you give it a number of cores (and you have enough queues).
Another question to think about (sorry, no answers here, just
questions): If you do run under Xen, is there interrupt load in both
the dom0 and the domU? In that case you'll get pounded. Maybe
dedicating an entire Ethernet port to the domU is a way to work around
that. I know Xen3 has provisions for that sort of thing but I haven't
used it.
/a
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