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Date: Mon, 04 Jan 2016 10:15:20 +0800
From: Lan Tianyu <tianyu.lan@intel.com>
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Subject: Re: [Qemu-devel] live migration vs device assignment (motivation)
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Yang Zhang <yang.zhang.wz@gmail.com>, "Tantilov,
	Emil S" <emil.s.tantilov@intel.com>, kvm@vger.kernel.org, aik@ozlabs.ru, qemu-devel@nongnu.org, Alexander Duyck <alexander.duyck@gmail.com>, lcapitulino@redhat.com, Blue Swirl <blauwirbel@gmail.com>, kraxel@redhat.com, "Rustad, Mark D" <mark.d.rustad@intel.com>, quintela@redhat.com, "Skidmore, Donald C" <donald.c.skidmore@intel.com>, Alexander Graf <agraf@suse.de>, Or Gerlitz <gerlitz.or@gmail.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Alex Williamson <alex.williamson@redhat.com>, Anthony Liguori <anthony@codemonkey.ws>, cornelia.huck@de.ibm.com, Ard Biesheuvel <ard.biesheuvel@linaro.org>, "Dong,
	Eddie" <eddie.dong@intel.com>, "Jani,
	Nrupal" <nrupal.jani@intel.com>, amit.shah@redhat.com, Paolo Bonzini <pbonzini@redhat.com>

On 2015年12月30日 00:46, Michael S. Tsirkin wrote:
> Interesting. So you sare saying merely ifdown/ifup is 100ms?
> This does not sound reasonable.
> Is there a chance you are e.g. getting IP from dhcp?
> 
> If so that is wrong - clearly should reconfigure the old IP
> back without playing with dhcp. For testing, just set up
> a static IP.

MAC and IP are migrated with VM to target machine and not need to
reconfigure IP after migration.

>>From my test result, ixgbevf_down() consumes 35ms and ixgbevf_up()
consumes 55ms during migration.

-- 
Best regards
Tianyu Lan