1666886 - Ensure we exercise QUIC/http2/http3/TLS code in PGO runs

Status: NEW

(Firefox Build System :: General, enhancement, P4)

Description

[:Gijs (he/him)]

When I did a brief overview of our PGO infra for our perf folks, they flagged up that it does not appear that we exercise much of our network stack as part of the PGO runs.

In theory, it should be possible to exercise our network/TLS stack and eke out some performance wins in that area. Although the PGO runs use an http server to serve the JS/DOM tests they run, AFAICT there will be no (or almost no, if we do any background requests that we've not redirected to /dev/null / localhost) use of TLS, or httpv2/QUIC/http3 etc.

As we already merge serveral profraw files, we could use xpcshell/browsertime/mach-perftest or other frameworks to gather this info if that's easier than integrating it into the existing pgo building run script.