Re: [PATCH net-next 0/2] tcp: fix high tail latencies in DCTCP

2018-06-30 Thread Lawrence Brakmo
On 6/30/18, 5:26 PM, "netdev-ow...@vger.kernel.org on behalf of Neal Cardwell" wrote: On Fri, Jun 29, 2018 at 9:48 PM Lawrence Brakmo wrote: > > When have observed high tail latencies when using DCTCP for RPCs as > compared to using Cubic. For example, in one setup there are 2 h

Re: [PATCH net-next 0/2] tcp: fix high tail latencies in DCTCP

2018-06-30 Thread Neal Cardwell
On Fri, Jun 29, 2018 at 9:48 PM Lawrence Brakmo wrote: > > When have observed high tail latencies when using DCTCP for RPCs as > compared to using Cubic. For example, in one setup there are 2 hosts > sending to a 3rd one, with each sender having 3 flows (1 stream, > 1 1MB back-to-back RPCs and 1 1

[PATCH net-next 0/2] tcp: fix high tail latencies in DCTCP

2018-06-29 Thread Lawrence Brakmo
When have observed high tail latencies when using DCTCP for RPCs as compared to using Cubic. For example, in one setup there are 2 hosts sending to a 3rd one, with each sender having 3 flows (1 stream, 1 1MB back-to-back RPCs and 1 10KB back-to-back RPCs). The following table shows the 99% and 99.9