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[Qemu-devel] [Bug 1470720] Re: high IRQ-TLB generates network interrupti
From: |
Robert van Leeuwen |
Subject: |
[Qemu-devel] [Bug 1470720] Re: high IRQ-TLB generates network interruptions |
Date: |
Mon, 08 Aug 2016 07:01:49 -0000 |
Disabling huge pages seem to help.
Strangely this should theoretically increase the issue but it so far we have
not seen issues after disabling THP.
(have not seen high load spikes in a week but this might also be holiday
related)
So other people can try it out:
echo never >/sys/kernel/mm/transparent_hugepage/defrag
echo never > /sys/kernel/mm/transparent_hugepage/enabled
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https://bugs.launchpad.net/bugs/1470720
Title:
high IRQ-TLB generates network interruptions
Status in QEMU:
New
Bug description:
we are having a problem in our hosts, all the vm running on them
suddenly, and for some seconds, lost network connectivity.
the root cause appears to be the increase of irb-tlb from low values
(less than 20) to more than >100k, that spike only last for some
seconds then everything goes back to normal
i've upload an screenshot of collectd for one hypervisor here
http://zumbi.com.ar/tmp/irq-tlb.png
we have hosts running precise (qemu 1.5, ovs 2.0.2, libvirt 1.2.2 and kernel
3.13) where the issue is frequent. also we have an small % of our fleet running
trusty (qemu 2.0.0 ovs 2.0.2 libvirt 1.2.2 and kernel 3.16) where the problem
seemed to be nonexistent until today
issue seems to be isolated to < 10% of our hypervisors, some hypervisors had
this problem every few days, others only once or twice. our vm are a black box
to us we don't know what users run on them, but mostly cpu and network bound
workload.
most of our guests run centos 6.5 (kernel 2.6.32)
vm are bridged to a linuxbridge then veth wired to an ovs switch
(neutron openvswitch agent setup)
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