Package: kernel
Version: Host(Debian 9.4):4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3
(2018-03-02) x86_64 GNU/Linux, Guest(Debian 9.1): 4.9.0-3-amd64 #1 SMP
Debian 4.9.30-2+deb9u2 (2017-06-26) x86_64 GNU/Linux
We have tested in two Debian 9.3 host.
Each host has one 82599 network card, we linked these card physically
by wire and then passthrough them to one VM (By VFIO) in
corresponding host. VM's operating system is Debian 9.1.
We config the ip for each VM, one is 192.168.0.1 and the other is 192.168.0.2.
On 192.168.0.1 we run below command:
ping 192.168.0.2 -i 0.01 | perl -nle 'BEGIN {$|++} print
scalar(localtime),"", $_'> outputfile_0530 &
After a night we got several outliers from the ping results. Below shows this.
As we can see, almost ping latency is 0.0xxms, but the outliers become 15/16ms.
We have see this phenomenon for several combination of host and
guest(all host is debian). And also guest uses the VF. Also with the
x710 network card.
There is no latency outliers by using centos 7.3 as the host.
So I think there maybe a bug in Debian system or something wrong in
our environment.
So could anyone reproduce this or give some hints about this?
Thanks,
Li Qiang
