On Mon, Oct 24, 2016 at 12:43:26PM +0100, Jeremy Harris wrote:
> On 24/10/16 04:05, Phil Pennock wrote:
> > On 2016-10-24 at 02:34 +0100, Jeremy Harris wrote:
> >> Of course, secondary thoughts, we don't know that the same sequences
> >> of library calls on FreeBSD as on Linux will do what's wanted.
>
> > https://people.freebsd.org/~pkelsey/tfo-tools/
>
> server:
> rc = setsockopt(listen_fd, IPPROTO_TCP, TCP_FASTOPEN,
> &on, sizeof(on));
>
> > * Need to guard against flag being undef
>
> Done for TCP_FASTOPEN, probably need to do for MSG_FASTOPEN.
>
> > * Need to gracefully handle the setsockopt() call failing
>
>
>
> OK, so
>
> - The library call sequence is identical
>
> - Use IPPROTO_TCP where Linux has SOL_TCP
>
> - The current coding for failures on the server side is
> ok (just ignore the setsockopt failure; we get a
> non-fastopen socket as before) for non-supporting kernels
>
> - The current coding for failures on the client side
> needs thought. I made it log-noisy but functional
> on the grounds that you do an extra syscall
> [the sendto(..., MSG_FASTOPEN, ...)] getting a fail
> every time on non-supporting kernels. There is
> a transport control, defaulting to enabled.
>
> Adding probe code in process startup might help, though
> the re-execs we do defeat that. Queue-runners would be
> ok but most deliveries are probably foreground.
>
> Should I change the default to not-enabled, for the
> medium-term?
Well there are other BSDs to here from.
Anyone from NetBsd, OpenBSD, DragonFly et al
get the same error?
> --
> Cheers,
> jeremy
>
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