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Re: [hybi] Flow control quota

Greg Wilkins <gregw@intalio.com> Mon, 04 June 2012 13:54 UTC

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Date: Mon, 04 Jun 2012 15:54:44 +0200
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From: Greg Wilkins <gregw@intalio.com>
To: Arman Djusupov <arman@noemax.com>
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Cc: hybi@ietf.org
Subject: Re: [hybi] Flow control quota
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Arman,

I think a solution could be to allow the sender to send a control
message, "No remaining Quota" meaning that the sender would send more
data if it had more quota.

This control method could be used in this case where there are not
sufficient window bytes available so as to allow a minimal frame to be
sent.

This control frame is also useful even if the quota is completely
consumed because if you follow the flow control discussion over on the
SPDY lists, you will see that fixed quotas will restrict the usage of
available bandwidth.  Thus I suspect that we will need to go to
dynamic window sizes.   If the sender can tell the receiver that it
has consumed it's window (and no the receiver can't tell that itself
because of network latency), then that can inform any receiver
decisions to increase the window size.

cheers

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