From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f176.google.com (mail-wi0-f176.google.com [209.85.212.176]) by dpdk.org (Postfix) with ESMTP id 1D3408DAA for ; Wed, 30 Sep 2015 14:16:06 +0200 (CEST) Received: by wicfx3 with SMTP id fx3so58712237wic.0 for ; Wed, 30 Sep 2015 05:16:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:subject:to:references:cc:from:message-id:date :user-agent:mime-version:in-reply-to:content-type :content-transfer-encoding; bh=F9EvkB+NF2PljnoqUZuth4rd6k9Ilko4L4G+yZjhxlg=; b=G64d+VBN5by+XOqCZBvM2hLBLEC5yogKbaBZW47W0yt/CQYoKiofg26FinSlXeuSYA 8ndndZsIJdRQ8XOfNiQLQPpShC5JfKk3+kb/CwjBzDCbXlT1zA1aCltmy4fO8yF+otf2 kL5ka+7HqYyAmCS9fpmE9IY4WoQEpvZhcflxt7RPuACAIwurlz+RYMk6pC3pmCAN+CsY ubIztH+7dGjlVXOK8IU5aoPf69tX2xJOWAbdA4O8laB/FFhHFLpiT2JkSRFtwLMNHd4K fzC3K/SICayMfur0qWZ8dg3p2d+ZVLIXQBXBjgiYITMEhpgfY2tw9CHOqU6AdlgT0Obv iaPQ== X-Gm-Message-State: ALoCoQmq1hllkBUPX9/+mFftCrHe8gQnIsH9p3iO4z1yXwT/JDPFDJX+Ot1pfWzlXy/MFDlIAtyP X-Received: by 10.180.184.134 with SMTP id eu6mr4641294wic.77.1443615365892; Wed, 30 Sep 2015 05:16:05 -0700 (PDT) Received: from [10.0.0.2] (bzq-79-180-197-252.red.bezeqint.net. [79.180.197.252]) by smtp.googlemail.com with ESMTPSA id t7sm446175wia.9.2015.09.30.05.16.04 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 30 Sep 2015 05:16:05 -0700 (PDT) To: "Michael S. Tsirkin" References: <20150927123914-mutt-send-email-mst@redhat.com> <560ABF25.9030300@cloudius-systems.com> <20150929235122-mutt-send-email-mst@redhat.com> <20150929144616.4e70b44c@urahara> <20150930004714-mutt-send-email-mst@redhat.com> <560BBB62.3050502@cloudius-systems.com> <20150930134533-mutt-send-email-mst@redhat.com> <560BC6C9.4020505@cloudius-systems.com> <20150930143927-mutt-send-email-mst@redhat.com> <560BCD2F.5060505@cloudius-systems.com> <20150930150115-mutt-send-email-mst@redhat.com> From: Vlad Zolotarov Message-ID: <560BD284.7040505@cloudius-systems.com> Date: Wed, 30 Sep 2015 15:16:04 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 In-Reply-To: <20150930150115-mutt-send-email-mst@redhat.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Cc: "dev@dpdk.org" Subject: Re: [dpdk-dev] Having troubles binding an SR-IOV VF to uio_pci_generic on Amazon instance X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Sep 2015 12:16:06 -0000 On 09/30/15 15:03, Michael S. Tsirkin wrote: > On Wed, Sep 30, 2015 at 02:53:19PM +0300, Vlad Zolotarov wrote: >> >> On 09/30/15 14:41, Michael S. Tsirkin wrote: >>> On Wed, Sep 30, 2015 at 02:26:01PM +0300, Vlad Zolotarov wrote: >>>> The whole idea is to bypass kernel. Especially for networking... >>> ... on dumb hardware that doesn't support doing that securely. >> On a very capable HW that supports whatever security requirements needed >> (e.g. 82599 Intel's SR-IOV VF devices). > Network card type is irrelevant as long as you do not have an IOMMU, > otherwise you would just use e.g. VFIO. Sorry, but I don't follow your logic here - Amazon EC2 environment is a example where there *is* iommu but it's not virtualized and thus VFIO is useless and there is an option to use directly assigned SR-IOV networking device there where using the kernel drivers impose a performance impact compared to user space UIO-based user space kernel bypass mode of usage. How is it irrelevant? Could u, pls, clarify your point? > >>> Colour me unimpressed. >>>