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 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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