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The gVisor RACK implementation appears to perfom badly, particularly in scenarios with higher BDP. This may have gone poorly noticed as a result of it being gated on SACK, which is not enabled by default in upstream gVisor, but itself has a higher positive impact on performance. Both the RACK and DACK implementations (which are now one) have overlapping non-completion of tasks in their work streams on the public tracker. Updates #9707 Signed-off-by: James Tucker <james@tailscale.com>