#33763: Consider setting TCP_NOTSENT_LOWAT to 1 byte on our TCP connections
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Reporter: dgoulet | Owner: (none)
Type: | Status: new
enhancement |
Priority: Medium | Milestone: Tor: 0.4.4.x-final
Component: Core | Version:
Tor/Tor |
Severity: Normal | Keywords: tor-relay performance scaling tcp
Actual Points: | Parent ID:
Points: 0.2 | Reviewer:
Sponsor: |
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This TCP option would provide us and important performance benefit at the
relay side.
In an effort to work on a new tor design to reduce kernel queuing delays,
see it as an improvement to KIST and tor architecture, Rob and I submitted
this paper to NetDev 0x14 conference in hope of sitting down with the
Linux kernel developers and network experts about this idea.
https://www.robgjansen.com/publications/epollcwnd-netdev2020.pdf
Ultimately we want a new poll TCP option in the kernel which our
experimentation shows how it improves performance drastically.
But turns out that starting with setting `TCP_NOTSENT_LOWAT` to 1 byte
would significantly improve performance close to what we wanted. See
`Figure 1.` (page 3) in the paper for the performance improvements.
Setting `TCP_NOTSENT_LOWAT` is minimal change to tor and thus we should do
it.
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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33763>
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