@olivierlambert I've dug into the issue a bit more, and it just gets stranger.
Downloading to my Macbook on the same network gets ~4MB/s. This means there is something strange going on with the control domain around remote downloads.
When I test the disk speed (which is an Samsung NVMe), the speed is 1.7GB/s:
[14:31 xcp-host ~]# dd if=/dev/zero of=testfile oflag=direct bs=1M count=5000 status=progress
4998561792 bytes (5.0 GB) copied, 3.000607 s, 1.7 GB/s
5000+0 records in
5000+0 records out
5242880000 bytes (5.2 GB) copied, 3.15049 s, 1.7 GB/s
When I test the network speed with Ookla's speedtest-cli it confirms a 1G connection, and a 1G transit to Europe (checked this twice because 1G Atlantic transits are rare):
[14:44 xcp-host ~]# speedtest -s 2023
Speedtest by Ookla
Server: LaFibre.info - Lyon (id = 2023)
ISP: Bell Canada
Latency: 108.05 ms (0.49 ms jitter)
Download: 960.47 Mbps (data used: 1.5 GB )
Upload: 172.11 Mbps (data used: 293.4 MB )
Packet Loss: 0.0%
Result URL: https://www.speedtest.net/result/c/b8f1da9f-5c57-4ad8-ad3b-729e1625affe
On my Macbook (on 802.11ac) I can download an Ubuntu image at ~14MB/s
➜ wget http://ubuntu.mirrors.ovh.net/ubuntu-releases/21.10/ubuntu-21.10-desktop-amd64.iso
--2021-11-16 14:49:41-- http://ubuntu.mirrors.ovh.net/ubuntu-releases/21.10/ubuntu-21.10-desktop-amd64.iso
Resolving ubuntu.mirrors.ovh.net (ubuntu.mirrors.ovh.net)... 213.32.5.7
Connecting to ubuntu.mirrors.ovh.net (ubuntu.mirrors.ovh.net)|213.32.5.7|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 3116482560 (2.9G) [application/octet-stream]
Saving to: ‘ubuntu-21.10-desktop-amd64.iso’
ubuntu-21.10-desktop-amd64.iso 3%[=> ] 107.27M 14.4MB/s eta 4m 14s
However on the control domain the download speed is considerably lower:
[14:52 xcp-host ~]# wget http://ubuntu.mirrors.ovh.net/ubuntu-releases/21.10/ubuntu-21.10-desktop-amd64.iso
--2021-11-16 14:53:03-- http://ubuntu.mirrors.ovh.net/ubuntu-releases/21.10/ubuntu-21.10-desktop-amd64.iso
Resolving ubuntu.mirrors.ovh.net (ubuntu.mirrors.ovh.net)... 213.32.5.7
Connecting to ubuntu.mirrors.ovh.net (ubuntu.mirrors.ovh.net)|213.32.5.7|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 3116482560 (2.9G) [application/octet-stream]
Saving to: ‘ubuntu-21.10-desktop-amd64.iso.1’
3% [==> ] 106,910,815 3.20MB/s eta 16m 47s
Have you ever see something like this before?
I saw you had some discussion on another thread regarding slow writes in a VM, but this looks like it affects the control domain as well:
https://xcp-ng.org/forum/topic/4865/slow-disk-writes-inside-vm-on-8-2
