Comment 12 for bug 1337761

Thanks, I understand. A fix of https://review.openstack.org/#/c/80225/ is common one and Mr. Yamamoto's one is only for swift-middleware. For Icehouse, it is better to have less effect modules like swift-middleware but for future 80225 is preferable arch if they have same performance. Anyway I'm looking forward to having both modules for extra measurement.