Sudheer Vinukonda created TS-3185:
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Summary: 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
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, 1 mb that more popular spdy enabled web
servers are using).
Here's some basic benchmarking data:
5 parallel uploads from APAC to the US with totally 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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