Increase the MTU on the virtual ethernet link #176
Merged
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This PR separates the MTU used for outgoing datagram traffic (for which we need to respect the Do Not Fragment bit) from the MTU used on the internal virtual ethernet link and bumps the latter to 8000. This should allow the TCP stack to use a larger segment size and to reduce the overhead per byte of payload.
This PR also allows the virtual ethernet MTU to be set via the database key
com.docker.driver.amd64-linux/slirp/mtu
Note this PR references a port of mirage/mirage-protocols#4 and mirage/mirage-tcpip#288 but we need to do some rebasing work for the v3 release anyway.