svn commit: r323177 - in head: sys/compat/cloudabi sys/contrib/cloudabi usr.bin/truss

[Ed Schouten]

Hi Jilles,

2017-09-15 12:58 GMT+01:00 Jilles Tjoelker <jilles at stack.nl>:
> Although this is correct from a functionality point of view (S_IFIFO and
> S_IFSOCK are probably expected to be different in a POSIX context, but
> this is unlikely to break anything that is not already broken), it is a
> partial reversal of previous changes to FreeBSD that created separate
> implementations for pipes (first unnamed pipes in 1996, later fifos in
> 2012 r232055). The main reason for these changes was performance.
>
> Unfortunately, I do not have concrete benchmarks in the CloudABI
> context.

That is important to keep in mind indeed. Thanks for pointing this out!

When I discussed this with some of the other folks working on
CloudABI, we came to the conclusion that this (potential) loss of
performance is acceptable in the nearby future. If it would really
affect us negatively, it should in theory be possible to reimplement
our streaming sockets and pipes with something as simple and fast as
FreeBSD's pipes, but still support file descriptor passing, etc.

-- 
Ed Schouten <ed at nuxi.nl>
Nuxi, 's-Hertogenbosch, the Netherlands