Man page changed as suggested.

Committed

Separate review for SSP, add man page info for FORTIFY.

I'll split the two parts up and try to come up with something for the docs.

In D47932#1099399, @dev_submerge.ch wrote:

Thanks for your input. I agree that we should keep an eye on performance, but I'd like to clarify: In our current refactoring of the format conversion we're not touching anything that changes the buffer sizes. And that's the only thing that could possibly affect audio latency. If latency really is of concern, then we'd have to look at smaller buffer sizes and how to make timers and scheduling more reliable. Also I doubt that we ever had the lowest overall latency, if you count in ASIO on Windows. I suspect that was about the latency introduced by the resampler.

FYI: at some point we had the sound system with the lowest latency. Ariff was comparing MS, OS X and Linux. I do not know if they have catched-up since then, but it may be worth the effort to check the performance / latency for such changes. Unfortunately I haven't found the info about the latency stuff he did, only his resampling quality comparison with other resampler implementations (https://people.freebsd.org/~ariff/z_comparison/). In https://people.freebsd.org/~ariff/old/ he has some old low latency diffs, so some interested soul could check which parts he modified to get lower latency.

Looks good (not run tested).

FYI, I added this to src.conf:

grep LOADER /etc/src.conf

LOADER_GZIP_SUPPORT=no
LOADER_BZIP2_SUPPORT=no
LOADER_BIOS_TEXTONLY=no
LOADER_NFS_SUPPORT=no
LOADER_TFTP_SUPPORT=no
LOADER_CD9660_SUPPORT=no

While I agree with the rationale and the change:

In D40972#1062704, @arrowd wrote:

I just bumped into this and I wonder what's the rationale to perform promotion during bectl activate.
I want to keep the BE snapshot I'm creating a new BE from, but activating new BE removes the snapshot (well, transfers it to the new BE's dataset).

Addendum - @netchild has been running -CURRENT with this patch series for some time with no issues encountered so far.
@netchild please correct me if I've misunderstood something, but the machine in question is a laptop with 8GB of RAM and it is primarily used to run various jailed services (~30 jails) and build packages.