From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: Re: Having troubles binding an SR-IOV VF to uio_pci_generic on Amazon instance Date: Thu, 1 Oct 2015 12:55:26 +0300 Message-ID: <20151001124211-mutt-send-email-mst@redhat.com> References: <560BDE24.8000308@scylladb.com> <20150930165359-mutt-send-email-mst@redhat.com> <560BF782.4070308@scylladb.com> <20150930175848-mutt-send-email-mst@redhat.com> <560C0171.7080507@scylladb.com> <20150930204016.GA29975@redhat.com> <20151001113828-mutt-send-email-mst@redhat.com> <560CF44A.60102@scylladb.com> <20151001120027-mutt-send-email-mst@redhat.com> <560CFB66.5050904@scylladb.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: "dev@dpdk.org" To: Avi Kivity Return-path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id C82AD8D91 for ; Thu, 1 Oct 2015 11:55:30 +0200 (CEST) Content-Disposition: inline In-Reply-To: <560CFB66.5050904@scylladb.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On Thu, Oct 01, 2015 at 12:22:46PM +0300, Avi Kivity wrote: > It's easy to claim that > a solution is around the corner, only no one was looking for it, but the > reality is that kernel bypass has been a solution for years for high > performance users, I never said that it's trivial. It's probably a lot of work. It's definitely more work than just abusing sysfs. But it looks like a write system call into an eventfd is about 1.5 microseconds on my laptop. Even with a system call per packet, system call overhead is not what makes DPDK drivers outperform Linux ones. -- MST