High TCP retransmission rates, only with Ceph

[Robert Stanford <rstanford8896@xxxxxxxxx>]

 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?

 Thank you

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