Hi,
Anyone can help?
Thanks
Patrick
Le 21/06/2024 à 10:57 AM, Patrick Chemla a écrit :
Hi all,
I am using libvirt for more than 10 years, and I have installed it on
lot of servers, with dozens of VMs. Network performances from VMs to
host have always been at top.
But first time I am in front of this problem:
Replacing an old platform made of 2 servers Fedora (36 upgraded to) 37
by 2 servers (H/W stronger) with Fedora 39, same .qcow2 diskimages for
VMs, I found out that response times are 2,5 times higher on the new
platform than the old one.
I have check H/W, new are better.
I have check standard network configuration, identical, virtio is best
(same as older) like I saw in my google searches.
Then I checked network performances:
On old platform, from VM1 to guest:
iperf3
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 27.7 GBytes 23.8 Gbits/sec 0
sender
[ 5] 0.00-10.00 sec 27.7 GBytes 23.8 Gbits/sec
receiver
On new platform:
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 2.67 GBytes 2.29 Gbits/sec 17
sender
[ 5] 0.00-10.00 sec 2.67 GBytes 2.29 Gbits/sec
receiver
So intrinsic network performances are ten times better on old platform.
All VMs network definitions are identical:
function='0x0'/>
On the host:
default
cfcfeeb6-3aa2-4732-9ca4-caf5b6554f2a
chatGPT has no clue too.
May I have some help?
Thx
Patrick
