I had a user who's working on tuning high-performance network file systems what the chances of upstreaming the Web10G patch to provide the RFC4898 TCP Extended Statistics MIB via netlink.
Yes, it's a tad on the intrusive side, and there's performance costs attached - but so are a lot of *other* things that people use all the time for kernel debugging, and it's a zero-hit thing for people who don't choose to configure it into their kernel. The added detailed status available from this will be useful for people who are doing tuning and development (consider how useful this would have been for the people who wrote the codel line discipline as part of the bufferbloat project). I'm willing to do the not-so-heavy lifting of getting the existing patch cleaned up to upstream standards and sheparded through the process, if there's any interest at all....
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