RFR: 8371475: HttpClient: Implement CUBIC congestion controller [v3]

[Daniel Jeliński]

On Mon, 17 Nov 2025 12:37:57 GMT, Daniel Jeliński <djelinski at openjdk.org> wrote:

>> src/java.net.http/share/classes/jdk/internal/net/http/quic/QuicCubicCongestionController.java line 114:
>> 
>>> 112:         if (!isAppLimited) {
>>> 113:             if (wEstBytes < cwndPriorBytes) {
>>> 114:                 wEstBytes += Math.max((long) (ALPHA * maxDatagramSize * packetBytes / congestionWindow), 1);
>> 
>> should we assert that congestionWindow is > 2 ?
>
> The congestion window is in bytes, and it's never reduced below 2*maxDatagramSize, which is never less than 2400. Not sure if we should add that particular assertion, but it would probably make sense to assert that packetAcked does not decrease the congestion window. I'll see what I can do.

I added the assertion in the base class

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PR Review Comment: https://git.openjdk.org/jdk/pull/28195#discussion_r2549159411