Messages in this thread | | | From | Long Li <> | Subject | RE: [RFC PATCH 09/09] Introduce cache=rdma moutning option | Date | Fri, 18 May 2018 20:58:08 +0000 |
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> 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- > technical@lists.samba.org> 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 <longli@microsoft.com> > >> > > >> > 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
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