On Mon, Apr 05, 2021 at 11:42:31PM +0000, Chuck Lever III wrote: > > On Apr 5, 2021, at 4:07 PM, Jason Gunthorpe <jgg@xxxxxxxxxx> wrote: > > On Mon, Apr 05, 2021 at 03:41:15PM +0200, Christoph Hellwig wrote: > >> On Mon, Apr 05, 2021 at 08:23:54AM +0300, Leon Romanovsky wrote: > >>> From: Leon Romanovsky <leonro@xxxxxxxxxx> > >>> > >>>> From Avihai, > >>> > >>> Relaxed Ordering is a PCIe mechanism that relaxes the strict ordering > >>> imposed on PCI transactions, and thus, can improve performance. > >>> > >>> Until now, relaxed ordering could be set only by user space applications > >>> for user MRs. The following patch series enables relaxed ordering for the > >>> kernel ULPs as well. Relaxed ordering is an optional capability, and as > >>> such, it is ignored by vendors that don't support it. > >>> > >>> The following test results show the performance improvement achieved > >>> with relaxed ordering. The test was performed on a NVIDIA A100 in order > >>> to check performance of storage infrastructure over xprtrdma: > >> > >> Isn't the Nvidia A100 a GPU not actually supported by Linux at all? > >> What does that have to do with storage protocols? > > > > I think it is a typo (or at least mit makes no sense to be talking > > about NFS with a GPU chip) Probably it should be a DGX A100 which is a > > dual socket AMD server with alot of PCIe, and xptrtrdma is a NFS-RDMA > > workload. > > We need to get a better idea what correctness testing has been done, > and whether positive correctness testing results can be replicated > on a variety of platforms. > > I have an old Haswell dual-socket system in my lab, but otherwise > I'm not sure I have a platform that would be interesting for such a > test. Not sure if Haswell will be useful for such testing. It looks like many of those subscribe to 'quirk_relaxedordering_disable'.
