> Is there anything FreeBSD can do that, say, Debian cannot?
Yes. Emulate traffic latency using IPFW and dummynet[^1]. There is no Linux (or OpenBSD, NetBSD) counterpart.
The ZFS implementation is less buggy.
Yes. Emulate traffic latency using IPFW and dummynet[^1]. There is no Linux (or OpenBSD, NetBSD) counterpart.
The ZFS implementation is less buggy.
I think much like other tools, think SELinux vs OpenBSD (unveil, etc) TC is more flexible (does more things) but there are _some things_ that can't do, and even for things both can do *BSD solutions are much simpler.
FreeBSD and Linux have been using the same implementation of ZFS for years.
On Linux, ARC memory is reclaimed using the kernel shrinker API which has historically been a problem. There has been several bugs leading to OOMs or system freeze due to high memory usage on systems that use ARC heavily.
On FreeBSD ARC is integrated directly with the VM subsystem. The stack is simpler, less bug-prone.
Now this is not a ZFS algo/whatever problem. It's an implementation/subsystem issue but it's still something to keep an eye on for the ZFS admin.
ps. I'm using ZFS on Linux for 15 years on a self-hosted, home backup server and only once I've had mem issues leading to crashes when I misconfigured the ARC. So it's fairly _stable_ but still not FreeBSD-level stable.
Is that still a problem?
A few weeks ago I noted a change in ARC-related documentation for OpenZFS on Linux. I can't remember the details (I can find them, if necessary) but I do remember that it was a significant improvement for Linux users.