Those retransmission happen at the TCP handshake or after that? Did you checked error counters on your NICs? Maybe your radosgw is sending too much requests to OSDs.
On 04/15/2018 10:54 PM, Robert Stanford wrote: > > 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 > <mailto: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 > ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > <http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com> > >
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