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xen-users
[Xen-users] Re: [quagga-users 10974] Re: Quagga on Xen - Latency / Bandw
On Jul 29, 2009, at 5:17 AM, sthaug@xxxxxxxxxx wrote:
I was wondering if anyone is running Quagga on Xen? What is
throughput/latency like?
This is a function of kernel forwarding performance. Quagga doesn't
do forwarding.
But the question is still of significant importance to a lot of Quagga
users. Thus, I suggest that it is an appropriate topic for the list.
Here's my earlier reply, which I (again, damnit) failed to send to the
list from an authorized address:
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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