From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: [PATCH net-next 0/3] vhost: accelerate metadata access through vmap() Date: Thu, 13 Dec 2018 18:10:19 +0800 Message-ID: <20181213101022.12475-1-jasowang@redhat.com> To: mst@redhat.com, jasowang@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Hi: This series tries to access virtqueue metadata through kernel virtual address instead of copy_user() friends since they had too much overheads like checks, spec barriers or even hardware feature toggling. Test shows about 24% improvement on TX PPS. It should benefit other cases as well. Please review Jason Wang (3): vhost: generalize adding used elem vhost: fine grain userspace memory accessors vhost: access vq metadata through kernel virtual address drivers/vhost/vhost.c | 281 ++++++++++++++++++++++++++++++++++++++---- drivers/vhost/vhost.h | 11 ++ 2 files changed, 266 insertions(+), 26 deletions(-) -- 2.17.1