Date: Mon, 26 May 2014 19:06:43 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Prashant Upadhyaya <praupadhyaya@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: Regarding Netmap in VM Message-ID: <20140526170643.GE40172@onelab2.iet.unipi.it> In-Reply-To: <CAPBAu3XfYXV8Y0y2pudvRtprwh0VzpSqK%2BiR_yi5EmMVrC6MOw@mail.gmail.com> References: <CAPBAu3XfYXV8Y0y2pudvRtprwh0VzpSqK%2BiR_yi5EmMVrC6MOw@mail.gmail.com>
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On Thu, May 22, 2014 at 09:28:45AM +0530, Prashant Upadhyaya wrote: > Hi, > > Suppose I am on x86 with Intel 82599 NIC. > Now I spawn a VM (running FreeBSD as guest OS with Netmap support) > For better I/O performance, I have two main choices -- > > 1. Pass the 82599 NIC as a PCI passthrough device into the VM > 2. Use SRIOV VF of 82599 into the VM > > Question is, will Netmap be able to utilize both the above environments > when I run the userspace application in the guest OS in the VM, or will > there be any issues. if i remember well we do not have sriov vf support yet in freebsd so you should follow the pci-passthrough approach. It should probably work, i am not 100% sure who is in charge of programming the IOMMU for the guest os when accessing a device through pci passthrough. If this part is missing, the symptoms you should see is that packets will have all bytes set to 0x00 cheers luigi
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