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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 11:24:52 +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.

I remember there was an issue with kvm64 anytime in the past, but this
is  ages ago I think. I will change that for new vserver starts. What (which 
flag) is
the exact issue with qemu64 vs. kvm64

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

From my logs:

migrate_set_speed 1200M
migrate_set_capability auto-converge on
migrate_set_capability xbzrle off

The max_downtime was default.

I will add debugging output around that assertion and try to reproduce.

Thank you,

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