Hi David, > -----Original Message----- > From: David Marchand <david.march...@redhat.com> > Sent: Friday, December 18, 2020 5:54 PM > To: Xia, Chenbo <chenbo....@intel.com> > Cc: dev <dev@dpdk.org>; Thomas Monjalon <tho...@monjalon.net>; Stephen > Hemminger <step...@networkplumber.org>; Liang, Cunming > <cunming.li...@intel.com>; Lu, Xiuchun <xiuchun...@intel.com>; Li, Miao > <miao...@intel.com>; Wu, Jingjing <jingjing...@intel.com> > Subject: Re: [PATCH 0/8] Introduce emudev library and iavf emudev driver > > On Fri, Dec 18, 2020 at 9:02 AM Chenbo Xia <chenbo....@intel.com> wrote: > > > > This series introduces a new device abstraction called emudev for > emulated > > devices. A new library (librte_emudev) is implemented. The first emudev > > driver is also introduced, which emulates Intel Adaptive Virtual > Function > > (iavf) as a software network device. > > > > This series has a dependency on librte_vfio_user patch series: > > http://patchwork.dpdk.org/cover/85389/ > > > > Background & Motivation > > ----------------------- > > The disaggregated/multi-process QEMU is using VFIO-over-socket/vfio-user > > as the main transport mechanism to disaggregate IO services from QEMU. > > Therefore, librte_vfio_user is introduced in DPDK to accommodate > > emulated devices for high performance I/O. Although vfio-user library > > provides possibility of emulating devices in DPDK, DPDK does not have > > a device abstraction for emulated devices. A good device abstraction > will > > be useful for applications or high performance data path driver. With > > this consideration, emudev library is designed and implemented. It also > > make it possbile to keep modular design on emulated devices by > implementing > > data path related logic in a standalone driver (e.g., an ethdev driver) > > and keeps the unrelated logic in the emudev driver. > > Since you mention performance, how does it compare to vhost-user/virtio?
I think it depends on the device specification (i.e., how complex its data path handling is). A first try on iavf spec shows better performance than virtio in our simple tests. Thanks! Chenbo > > > -- > David Marchand
