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https://issues.apache.org/jira/browse/TS-3185?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sudheer Vinukonda resolved TS-3185.
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Resolution: Fixed
Change committed to master
> Increase the default spdy initial_window_size_in setting to 1 mb
> ----------------------------------------------------------------
>
> Key: TS-3185
> URL: https://issues.apache.org/jira/browse/TS-3185
> Project: Traffic Server
> Issue Type: Improvement
> Components: SPDY
> Reporter: Sudheer Vinukonda
> Assignee: Sudheer Vinukonda
>
> Currently, proxy.config.spdy.initial_window_size_in is set to the default
> value 64K (suggested in
> http://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft3-1). This
> suggested value is perhaps due to historic reasons when the window_size was
> only allowed 2 octets in the older spdy versions.
> Note that, ideally, the client (sender) should still be able to defer the
> upload when the send window is exhausted until the server (receiver) sends an
> WINDOW_UPDATE frame indicating to resume the sending.
> Even so, 64K may still be too small and may result in increasing upload
> latencies, especially, in case of large concurrent upload scenarios. Hence, I
> would like to bump up the default value for the spdy initial window
> size to a higher value (preferably to 1 mb like some of the more popular spdy
> enabled web servers are using).
> Here's some basic benchmarking data (thanks to [~yzlai]):
> 5 parallel uploads from APAC to the US with a total of 2,299,250 bytes.
> spdy=off, 2.34 secs
> spdy=on, spdy.initial_window_size_in=64k: 11.28 secs
> spdy=on, spdy.initial_window_size_in=1M: 1.99 secs
> spdy=on, spdy.initial_window_size_in=10M: 2.01 secs
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