I should have been more clear. The TCP retransmissions are on the OSD host.
On Sun, Apr 15, 2018 at 1:48 PM, Paweł Sadowski <c...@sadziu.pl> wrote: > On 04/15/2018 08:18 PM, Robert Stanford wrote: > >> >> Iperf gives about 7Gb/s between a radosgw host and one of my OSD hosts >> (8 disks, 8 OSD daemons, one of 3 OSD hosts). When I benchmark radosgw >> with cosbench I see high TCP retransmission rates (from sar -n ETCP 1). I >> don't see this with iperf. Why would Ceph, but not iperf, cause high TCP >> retransmission rates? >> > > Most probably your application (radosgw in this case) is not able to > process requests fast enough and some packets are dropped. > > -- > PS > _______________________________________________ > ceph-users mailing list > firstname.lastname@example.org > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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