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[quicwg/base-drafts] MUST requirement on bursts smaller than IW is too restrictive (#3892)

Praveen Balasubramanian <notifications@github.com> Sun, 12 July 2020 16:56 UTC

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Date: Sun, 12 Jul 2020 09:56:14 -0700
From: Praveen Balasubramanian <notifications@github.com>
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Subject: [quicwg/base-drafts] MUST requirement on bursts smaller than IW is too restrictive (#3892)
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"Implementations MUST either use pacing or another method to limit such bursts to the initial congestion window; see Section 7.2."  

This precludes use of segmentation offload of sizes greater than IW. Hardware does not pace TSO for TCP or USO for UDP. In datacenters we routinely send bursts that are higher without causing loss. Both Linux and Windows TCP send bursts larger than IW (up to 64k) at higher bandwidths. Higher bursts are required for achieving high data rates. 

This text should be changed to a SHOULD. 


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