Hi,
04:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
at both hosts and Arista 7050S-64 between.
Both hosts were part of active ceph cluster.
On Thu, Nov 6, 2014 at 5:18 AM, Wido den Hollander <wido@xxxxxxxx> wrote:
Hello,
While working at a customer I've ran into a 10GbE latency which seems
high to me.
I have access to a couple of Ceph cluster and I ran a simple ping test:
$ ping -s 8192 -c 100 -n <ip>
Two results I got:
rtt min/avg/max/mdev = 0.080/0.131/0.235/0.039 ms
rtt min/avg/max/mdev = 0.128/0.168/0.226/0.023 ms
Both these environment are running with Intel 82599ES 10Gbit cards in
LACP. One with Extreme Networks switches, the other with Arista.
Now, on a environment with Cisco Nexus 3000 and Nexus 7000 switches I'm
seeing:
rtt min/avg/max/mdev = 0.160/0.244/0.298/0.029 ms
As you can see, the Cisco Nexus network has high latency compared to the
other setup.
You would say the switches are to blame, but we also tried with a direct
TwinAx connection, but that didn't help.
This setup also uses the Intel 82599ES cards, so the cards don't seem to
be the problem.
The MTU is set to 9000 on all these networks and cards.
I was wondering, others with a Ceph cluster running on 10GbE, could you
perform a simple network latency test like this? I'd like to compare the
results.
--
Wido den Hollander
42on B.V.
Ceph trainer and consultant
Phone: +31 (0)20 700 9902
Skype: contact42on
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Łukasz Jagiełło
lukasz<at>jagiello<dot>org
lukasz<at>jagiello<dot>org
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