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

From: Paolo Bonzini
Subject: Re: [Qemu-devel] kvmclock_current_nsec: Assertion `time.tsc_timestamp <= migration_tsc'
Date: Tue, 10 Feb 2015 11:17:49 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0

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
> type=tap,id=guest19,script=no,downscript=no,ifname=tap19,vnet_hdr
> -device virtio-net-pci,netdev=guest19,mac=52:54:00:80:00:55 -netdev
> type=tap,id=guest20,script=no,downscript=no,ifname=tap20,vnet_hdr
> -device virtio-net-pci,netdev=guest20,mac=52:54:00:80:00:6f -netdev
> type=tap,id=guest21,script=no,downscript=no,ifname=tap21,vnet_hdr
> -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



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