RFR: 8368739: [AIX] java/net/httpclient/http3/H3SimpleGet.java#useNioSelector and #with-continuations fail

[Daniel Fuchs]

On Wed, 29 Oct 2025 09:22:02 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> After [JDK-8349910](https://bugs.openjdk.org/browse/JDK-8349910) the 2 tests java/net/httpclient/http3/H3SimpleGet.java#useNioSelector and #with-continuations fail on AIX; all the other HTTP3 related tests seem to do fine on AIX.
> 
> The tests fail in the runs with  `-Djdk.httpclient.quic.defaultMTU=16336` .  This setting has to be adjusted to a lower value for AIX to work.

Hi Matthias - thanks for taking care of this one. This looks good. One alternative could have been to reduce the MTU to 8k uniformally, but what you are proposing is good. I am testing in our CI and will approve if I don't see any failure (and I don't expect this change would cause any).

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PR Review: https://git.openjdk.org/jdk/pull/28041#pullrequestreview-3394871360