Re: [ceph-users] High TCP retransmission rates, only with Ceph

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.

Re: [ceph-users] High TCP retransmission rates, only with Ceph

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 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

Re: [ceph-users] High TCP retransmission rates, only with Ceph

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.