perfSONAR User Q&A and Other Discussion

[Brian Tierney <>]

On Sunday, June 26, 2016, Brian Candler <> wrote:

On 25/06/2016 15:23, Brian Tierney wrote:

By "smaller buffer" do you mean smaller TCP window size?

I mean the switch buffer, as described here:

http://fasterdata.es.net/network-tuning/router-switch-buffer-size-issues/

and

http://fasterdata.es.net/network-tuning/router-switch-buffer-size-issues/switch-buffer-testing/

But if that's what's limiting the throughput, wouldn't packet drops / retransmissions be observed?

Starting a couple years ago, I've seen this pattern on Linux hosts. 

There seem to be other factors that cause the TCP window size to stop growing.

 

-- 
Brian Tierney, http://www.es.net/tierney
Energy Sciences Network (ESnet), Berkeley National Lab
http://fasterdata.es.net