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Bug#900461: marked as done (Ping latency outliers using SRIOV network card)

Your message dated Thu, 20 Feb 2025 12:14:32 +0100 (CET)
with message-id <20250220111432.070C1BE2EE7@eldamar.lan>
and subject line Closing this bug (BTS maintenance for src:linux bugs)
has caused the Debian Bug report #900461,
regarding Ping latency outliers using SRIOV network card
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
900461: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900461
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
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

--- End Message ---
--- Begin Message --- 
Hi

This bug was filed for a very old kernel or the bug is old itself
without resolution.

If you can reproduce it with

- the current version in unstable/testing
- the latest kernel from backports

please reopen the bug, see https://www.debian.org/Bugs/server-control
for details.

Regards,
Salvatore

--- End Message ---
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