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.
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