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Re: [Qemu-devel] Broken live Migration in Qemu

From: Peter Lieven
Subject: Re: [Qemu-devel] Broken live Migration in Qemu
Date: Mon, 6 Jun 2016 17:51:28 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0

Am 06.06.2016 um 15:32 schrieb Peter Lieven:

during internal testing of Qemu I found a vServer running Ubuntu 12.04 
(kernel 3.13) and a slave SQL server to
stop replicating from the master. This seems to be reproducible. It is possible 
to continue replication when issuing a slave stop / slave start.
There is no error visible on the vServer.

Has anyone a fix in mind that could be related to such an issue?

Host kernel in Linux 4.4, Guest kernel 3.13. Guest driver is virtio-blk via 
iSCSI. Emulated vCPU is Westmere.

After a lot of testing I found out that obviously thats no block driver 
problem, but a regression in the virtio-net or the network stack.

qemu_announce_self() is generating packets for all NICs, but it seems they are 
no longer emitted. This worked at least in qemu-2.2.0 with
the same guest kernel and host kernel.

I will continue debugging tomorrow why this happens.


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