From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH v2 net-next 0/4] vhost_net: Avoid vq kicks during busyloop Date: Wed, 04 Jul 2018 21:31:47 +0900 (KST) Message-ID: <20180704.213147.556876353476580416.davem@davemloft.net> References: <1530603094-2476-1-git-send-email-makita.toshiaki@lab.ntt.co.jp> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1530603094-2476-1-git-send-email-makita.toshiaki@lab.ntt.co.jp> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: makita.toshiaki@lab.ntt.co.jp Cc: kvm@vger.kernel.org, mst@redhat.com, netdev@vger.kernel.org, virtualization@lists.linux-foundation.org List-Id: virtualization@lists.linuxfoundation.org From: Toshiaki Makita Date: Tue, 3 Jul 2018 16:31:30 +0900 > Under heavy load vhost tx busypoll tend not to suppress vq kicks, which > causes poor guest tx performance. The detailed scenario is described in > commitlog of patch 2. > Rx seems not to have that serious problem, but for consistency I made a > similar change on rx to avoid rx wakeups (patch 3). > Additionary patch 4 is to avoid rx kicks under heavy load during > busypoll. > > Tx performance is greatly improved by this change. I don't see notable > performance change on rx with this series though. ... Series applied, thank you.