[Bug 260764] Feature request: Control over NFS bg timeout

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 30 Dec 2021 02:13:39 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260764

--- Comment #1 from Rick Macklem <rmacklem@FreeBSD.org> ---
Well, I think this is easier said than done.
Without actually doing testing, I think the
timeout is "how long it takes for connect(2)
to return" and I think this is the TCP socket
option TCP_KEEPINIT.

TCP_KEEPINIT can be changed by a setsockopt(),
but this is all buried inside the RPC functions
in libc and there is no argument to the function
to adjust the timeout.
--> I think it would involve modifying the RPC
    library semantics, via some new function that
    would set the timeout.

I will take a closer look, but I'll admit that
adding a change like this to the RPC library
does not excite me.

Would a new NFS mount option that says "do background
right away and don't wait for a failure" be sufficient
for your case?

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