> -----Original Message----- > From: dev [mailto:dev-boun...@openvswitch.org] On Behalf Of Tahhan, > Maryam > > > On Tue, Apr 14, 2015 at 9:37 AM, Rogers, Gerald > > <gerald.rog...@intel.com> > > wrote: > > > There are some deployments that are using or require older OS > > > distributions using qemu versions prior to version 2.1, thus would > > > require the support for vHost-cuse. Most general reason is > > > qualification cycles for new OS versions. The patch provides > > > compile time support for choosing which vHost version to use. The > > > support for vhost-cuse should be kept for at least several releases > > > with documentation indicating it will be eventually deprecated. > > > > I think it's a bit odd to mark something as deprecated before it even > > makes it to the first release. This is brand new functionality in OVS > > and so I'm not sure why existing deployments would have much of an > > impact. Based on the list of distributions that Kevin sent out, it > > seems like the most recent version of each of them supports a > > sufficiently new version of qemu. That seems reasonable enough to > > support to me given that there's still quite a bit of active development > going on here. > > From the list Kevin sent on the distributions that would be impacted are: > Fedora 20: 1.6.2 > CentOS 7/ RHEL 7.0: 1.5.3 > Debian wheezy: 1.1.2 > > As this is what is/isn't supported with the Qemu versions: > Qemu version vHost Cuse vHost User > < 2.0 Supported Not Supported > 2.0 Not supported Not supported > > 2.0 Supported Supported > > From an OPNFV project perspective there would be an impact on any > projects that which to use vhost as a guest access method with OVS + DPDK if > vhost-cuse was removed. The first release "Arno" is using CentOS 7 and > QEMU 1.5.3. > so removing support for cuse would mean the projects would not be able to > use vhost as a guest access method. One such project is the > characterize_vswitch_performance_for_telco_nfv_use_cases which is > initially targeting OVS + DPDK and vhost-cuse as a guest access method. > Also, not everyone is going to consume it via a distribution. Some users, in the telco space, will just download the tarball and deploy on an older distribution or perhaps a custom linux-based OS which may not have a newer version of qemu.
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