From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lan Tianyu <tianyu.lan@intel.com>
Subject: Re: [Qemu-devel] live migration vs device assignment (motivation)
Date: Mon, 04 Jan 2016 10:15:20 +0800
Message-ID: <5689D5B8.2090208@intel.com>
References: <20151210101840.GA2570@work-vm> <566961C1.6030000@gmail.com> <20151210114114.GE2570@work-vm> <56698E68.5040207@intel.com> <CAKgT0UduOMvnVAUvRgnXkMPDwvOBh_5RimCgnb0zRr7aOyza4A@mail.gmail.com> <566D9320.8000209@intel.com> <CAKgT0Uc9g5aqKUKudD4Rj+1KfbGZn6VLzZxGv7UrRK+dy3wEVA@mail.gmail.com> <567CEA53.5030601@intel.com> <20151225140336-mutt-send-email-mst@redhat.com> <56817476.8080607@intel.com> <20151229184426-mutt-send-email-mst@redhat.com>
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Cc: Alexander Duyck <alexander.duyck@gmail.com>,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	Yang Zhang <yang.zhang.wz@gmail.com>, qemu-devel@nongnu.org,
	"Tantilov, Emil S" <emil.s.tantilov@intel.com>,
	kvm@vger.kernel.org, Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	aik@ozlabs.ru, "Skidmore, Donald C" <donald.c.skidmore@intel.com>,
	quintela@redhat.com, "Dong, Eddie" <eddie.dong@intel.com>,
	"Jani, Nrupal" <nrupal.jani@intel.com>,
	Alexander Graf <agraf@suse.de>,
	Blue Swirl <blauwirbel@gmail.com>, cornelia.huck@de.ibm.com,
	Alex Williamson <alex.williamson@redhat.com>,
	kraxel@redhat.com, Anthony Liguori <anthony@codemonkey.ws>,
	amit.shah@redhat.com, Paolo Bonzini <pbonzini@redhat.com>,
	"Rustad, Mark D" <mark.d.rustad@intel.com>, lcapitulino@redhat.com,
	Or Gerlitz <gerlitz.or@gmail.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
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On 2015=E5=B9=B412=E6=9C=8830=E6=97=A5 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?
>=20
> 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.

=46rom my test result, ixgbevf_down() consumes 35ms and ixgbevf_up()
consumes 55ms during migration.

--=20
Best regards
Tianyu Lan