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Re: [Qemu-devel] kvmclock_current_nsec: Assertion `time.tsc_timestamp <=

From: Peter Lieven
Subject: Re: [Qemu-devel] kvmclock_current_nsec: Assertion `time.tsc_timestamp <= migration_tsc'
Date: Tue, 10 Feb 2015 11:27:27 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0

Am 10.02.2015 um 11:17 schrieb Paolo Bonzini:

On 10/02/2015 11:03, Peter Lieven wrote:
My hope was that anyone has observed this post 2.2.0 already and there
is a fix available ;-)

Can you indicate what info would be helpful debugging this?

Cmdline is:
/usr/bin/qemu-2.2.0  -enable-kvm  -M pc-i440fx-2.1  -nodefaults -netdev
-device virtio-net-pci,netdev=guest19,mac=52:54:00:80:00:55 -netdev
-device virtio-net-pci,netdev=guest20,mac=52:54:00:80:00:6f -netdev
-device virtio-net-pci,netdev=guest21,mac=52:54:00:80:00:75 -serial
null  -parallel null  -m 496 -monitor tcp:0:4011,server,nowait -vnc :11
-qmp tcp:0:3011,server,nowait  -name 'gw-5000123'  -boot
order=nc,menu=on  -drive
index=2,media=cdrom,if=ide,cache=unsafe,aio=native,readonly=on  -k de
-incoming tcp:0:5011  -pidfile /var/run/qemu/vm-115.pid -mem-path
/hugepages  -mem-prealloc  -rtc base=utc -usb -usbdevice tablet -no-hpet
-vga vmware  -cpu qemu64
First of all (but unrelated to the bug) do not use "-cpu qemu64" with KVM.

Second, what downtime or bandwidth setting?  What is the actual
downtime?  Can you print time.tsc_timestamp and migration_tsc on the

I also found this 'info migrate' output:

capabilities: xbzrle: off
rdma-pin-all: off
auto-converge: on
zero-blocks: on
Migration status: completed
total time: 604 milliseconds
downtime: 187 milliseconds
setup: 1 milliseconds
transferred ram: 331529 kbytes
throughput: 4498.48 mbps
remaining ram: 0 kbytes
total ram: 525700 kbytes
duplicate: 49083 pages
normal: 82613 pages
normal bytes: 330452 kbytes
dirty sync count: 0


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