I know that this is not xfs discussion but last question 
With xfs my avg boot up performance is under 30-35s without any vm started.
if you have free time, can you run systemd-analyze on dom0 without any auto start vm?
can you run systemd-analyze on dom0 without any auto start vm?
[user@dom0 ~]$ sudo systemd-analyze
Startup finished in 3.281s (kernel) + 5.351s (initrd) + 8.789s (userspace) = 17.422s
Lenovo ThinkPad T430
i7-3840QM
Samsung V-NAND SSD 860 PRO
time to start a qube = 10 sec
Without (firmware) and (loader) it just take me 13s to boot, and avg 6-8s for vm.
But I surprised even with old machine it almost beat :
- I7-10750H
- Seagate FireCuda 510
I’m interested in benchmarking btrfs next day and sorry for being oot.
avg 6-8s for vm
Well, it depends how I measure.
[user@dom0 ~]$ date && qvm-start qube && date
Fri Oct 15 19:35:43 CDT 2021
Fri Oct 15 19:35:51 CDT 2021
→ 8 sec
[user@dom0 ~]$ date && qvm-run --pass-io qube "echo hello" && date
Fri Oct 15 19:39:04 CDT 2021
hello
Fri Oct 15 19:39:14 CDT 2021
→ 10 sec
How do you measure? My point being: I believe I/O performance is of much higher importance than how many instructions per second your CPU can provide.
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Now it kind of is (I split the threads). 
Have try benchmarking today, using btrfs increase 2 second in dom0, and 1 sec in vm, haven’t try with large vm storage.