[dpdk-dev] [PATCH v5 09/10] net/ifc: support SW assisted VDPA live migration

Maxime Coquelin maxime.coquelin at redhat.com
Tue Dec 18 12:33:21 CET 2018



On 12/18/18 9:02 AM, Xiao Wang wrote:
> In SW assisted live migration mode, driver will stop the device and
> setup a mediated virtio ring to relay the communication between the
> virtio driver and the VDPA device.
> 
> This data path intervention will allow SW to help on guest dirty page
> logging for live migration.
> 
> This SW fallback is event driven relay thread, so when the network
> throughput is low, this SW fallback will take little CPU resource, but
> when the throughput goes up, the relay thread's CPU usage will goes up
> accordingly.
> 
> User needs to take all the factors including CPU usage, guest perf
> degradation, etc. into consideration when selecting the live migration
> support mode.
> 
> Signed-off-by: Xiao Wang<xiao.w.wang at intel.com>
> ---
>   drivers/net/ifc/base/ifcvf.h |   1 +
>   drivers/net/ifc/ifcvf_vdpa.c | 346 ++++++++++++++++++++++++++++++++++++++++++-
>   2 files changed, 344 insertions(+), 3 deletions(-)

Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>

Thanks,
Maxime


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