Date: Tue, 22 Jul 2025 14:06:11 -0700 From: Tom Arnold <xyzzy@sysabend.org> To: freebsd-virtualization@freebsd.org Subject: Running FreeBSD 14.3 under XCP-NG performance issues Message-ID: <20250722210611.GC27456@moo.sysabend.org>
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I've been trying to get FreeBSD happy under our new XCP-NG setup. The biggest problem I'm seeing right now is disk performance. I built the VM on a 200gig LUN mapped from a Dell MD5. This disk happened to show up as /dev/ada0 and was installed with ZFS on Root. After rebooting I added some more LUNs and put ZFS on them. These disks happen to show up with /dev/xbd# as Xen seems to be being detected after the reboot. Doing a simple performance test with dd ( if=/dev/zero of=file bs=1m ) on anything with a /dev/ada# entry I get a transfer rate of something around 6777 MB/s. Doing the same test on a device that is /dev/xbd# I get around half that. If I fight a bit and disable xenguest and get one of the "newer" LUNs over to a /dev/ada# device the performance goes up into the 6777 MB/s range. I figure I'm doing something wrong here but docs seem to be sparse on this and Vates doesn't fully support FreeBSD so its a YMMV sorta thing. Any suggestions? Thanks. -Tom -- -------------------------------------------------------------------- - Tom Arnold - "...is it a virus, a drug, or a religion?" - Sysabend Caretaker - Juanita Shrugs. "What's the difference?" ------------------------ -- Neal Stephenson, Snow Crash
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