> Subject: Re: [RFC PATCH 09/09] Introduce cache=rdma moutning option > > On Fri, May 18, 2018 at 12:00 PM, Long Li via samba-technical <samba- > [email protected]> wrote: > >> Subject: Re: [RFC PATCH 09/09] Introduce cache=rdma moutning option > >> > >> On Thu, May 17, 2018 at 05:22:14PM -0700, Long Li wrote: > >> > From: Long Li <[email protected]> > >> > > >> > When cache=rdma is enabled on mount options, CIFS do not allocate > >> > internal data buffer pages for I/O, data is read/writen directly to > >> > user > >> memory via RDMA. > >> > >> I don't think this should be an option. For direct I/O without > >> signing or encryption CIFS should always use get_user_pages, with or > without RDMA. > > > > Yes this should be done for all transport. If there are no objections, I'll > > send > patches to change this. > > Would this help/change performance much?
On RDMA, it helps with I/O latency and reduces CPU usage on certain I/O patterns. But I haven't tested on TCP. Maybe it will help a little bit. > > > > -- > Thanks, > > Steve
