| From: | Rui DeSousa <rui(dot)desousa(at)icloud(dot)com> |
|---|---|
| To: | Don Seiler <don(at)seiler(dot)us> |
| Cc: | Johannes Truschnigg <johannes(at)truschnigg(dot)info>, pgsql-admin <pgsql-admin(at)postgresql(dot)org> |
| Subject: | Re: Streaming Replication Networking Best Practices? |
| Date: | 2018-05-14 21:02:47 |
| Message-ID: | 9DF82A39-C753-486C-B896-C5346D19BE58@icloud.com |
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| Thread: | |
| Lists: | pgsql-admin |
> On May 14, 2018, at 4:22 PM, Don Seiler <don(at)seiler(dot)us> wrote:
>
> Ping shows a pretty solid latency of 49-50 ms.
>
Depending on your window size; that will determine the throughput (not to exceed the link speed).
TCP Window / latency = throughput; i.e. if the windows is 16kb with 50 ms latency the max throughput is 640kb/s or 5.12Mbps
16/.05 = 640kb/s
The window size will vary during the connection; it will start off small and then progress to your max setting. Now you need to determine how large you window can get and what is it actually doing; that will require observing the connection via tcpdump or similar tools. Dropped packets will prevent the window size from increasing and also cause retransmits.
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