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Re: Performance degradation in 4.15 and above
On 2023-05-19 11:48, Tomas Mozes wrote:
Hi,
I have an old Proliant DL380 server running Gentoo Linux as
Dom0 on Xen
with several DomUs also running Gentoo Linux. After
upgrading to 4.15 I
have noticed that in some of the DomUs (that are used as
Kubernetes
nodes) the load slowly keeps climbing until it reaches a
level that the
DomU becomes unresponsive and needs to be restarted. This
issue is not
present when running on Xen 4.14 and went away once I
downgraded bask to
4.14. The same issue presented itself again after upgrading
to 4.16.
According to some Munin graphs the load increases by 2-4 per
day, but as
far as I can tell nothing else really changes (CPU usage,
number of
processes - ) so I don't really have an idea what is causing
the issue.
Both the Dom0 and DomUs are running on a hardened-gentoo
kernel version
5.10.156 (see the attached .config).
If anyone has any pointers regarding where to look or what
can be
tweaked, I would be grateful for the information.
Regards,
Gabor
Hello Gabor,
I remember having these problems:
- with credit2 scheduler
I am using the credit scheduler since after upgrading to 4.12 my box
stalled several times and I followed the recommendation from the
Gentoo wiki
( https://wiki.gentoo.org/wiki/Xen#Xen_domU_hanging_with_Xen_4.12.2B)
which seemed to solve the issue.
- kernel 5.15 in some point of time (around kernel
5.15.32), but is ok with current versions.
Tomas
Maybe try a newer kernel? I'm using 5.15 LTS and it worked fine with Xen 4.15, just upgrading to Xen 4.16 on Gentoo.
Best regards,
Tomas
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