[tor-bugs] #34010 [Core Tor/Tor]: Use io_uring when available

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#34010: Use io_uring when available
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 Reporter:  torry        |          Owner:  (none)
     Type:  enhancement  |         Status:  new
 Priority:  Medium       |      Component:  Core Tor/Tor
  Version:               |       Severity:  Normal
 Keywords:  io_uring     |  Actual Points:
Parent ID:               |         Points:
 Reviewer:               |        Sponsor:
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 Io_uring is a new subsystem for asynchronous transfers of network or
 disk/storage i/o.

 https://lwn.net/Articles/810414/

 It has a great potential in handling concurrent connections and transfers
 over multiple sockets or disk files.

 Samba has implemented this on disk io as side, and ib my home / nas
 setting, it almost doubled total throughput on concurrent reads.

 In network situations, it is said to be able to scale to 3-5x performance.

 Liburing is a library to be able to utilise this subsystem. I think that
 Tor really should look at io_uring due to the massive concurrency of a
 relay.

 In my own experience running a relay on a low end hardware for two years
 and the low end hardware was never able to fill the fiber connection. It
 seems to be quite a lot of internal overhead, perhaps io_uring could
 really help.

 **References**
 https://lwn.net/Articles/810414/
 https://lwn.net/Articles/776428/
 https://git.kernel.dk/cgit/liburing/
 https://github.com/axboe/liburing

 **Other projects using io_uring**
 https://wiki.samba.org/index.php/Samba_4.12_Features_added/changed#.27io_uring.27_vfs_module
 https://github.com/ceph/ceph/pull/27392

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34010>
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