Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
2014-04-11 12:30 GMT+02:00 Steve Thompson wrote: > On Fri, 11 Apr 2014, Ben RUBSON wrote: > > Replication link is a a 10 Ge link, throughput with iperf (6 threads or >> more) gives 7.7 Gb/s (918 MB/s) bidirectional. >> Could be tuned, but well, enough to sustain my RAID array at 680 MB/s. >> Latency of 10.8 ms between the 2 servers. >> MTU 9012. >> > > Something that strikes me is your latency and throughput: assuming it is > not a typo, that latency is remarkably high. Between two of my 10GbE > servers, I see an average latency of 0.07ms (from ping) and an iperf > throughput of 9.8 Gb/s with MTU=9000 and 1 thread. > Yes I did not tell that replication link is a long distance link, the 2 servers are separated by hundreds of kilometers :-) Which explains the 10.8 ms latency. I made further tests, and seems that my issue is that I did not tune my TPC stack according to the 10 G speed. However, with tuning (window size &co), I did not manage to go beyond 7.3 Gb/s (iperf, 1 thread). Without tuning I was at 2.15 Gb/s (iperf, 1 thread). Did you do something specific to go up to 9.8 Gb/s ? Thank you ! Best regards, Ben -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20140411/5e47cd88/attachment.htm>