From mboxrd@z Thu Jan 1 00:00:00 1970 From: Amir Vadai Subject: Re: Socket Direct Protocol: help (2) Date: Wed, 14 Apr 2010 18:03:57 +0300 Message-ID: <4BC5D95D.3010108@mellanox.co.il> References: <13381_1271060138_o3C8FUH8013968_2977669.1271060085255.SLOX.WebMail.wwwrun@imap.lnl.infn.it> <1246722.1271082830120.SLOX.WebMail.wwwrun@imap.lnl.infn.it> <2EFBCAEF10980645BBCFB605689E08E9047C7402DA@azsmsx506.amr.corp.intel.com> <4BC49E2B.3000804@opengridcomputing.com> <2EFBCAEF10980645BBCFB605689E08E9047C7405A0@azsmsx506.amr.corp.intel.com> <4BC4D22A.6020700@opengridcomputing.com> <2EFBCAEF10980645BBCFB605689E08E9047C7405E9@azsmsx506.amr.corp.intel.com> <7037536.1271235105513.SLOX.WebMail.wwwrun@imap.lnl.infn.it> <4BC5D1D3.3020004@mellanox.co.il> <4BC5D727.4090400@opengridcomputing.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4BC5D727.4090400-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Steve Wise , Andrea Gozzelino Cc: "Tung, Chien Tin" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "rolandd-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org" , "peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org" , "pavel-+ZI9xUNit7I@public.gmane.org" , "mingo-X9Un+BFzKDI@public.gmane.org" , Eric B Munson List-Id: linux-rdma@vger.kernel.org You are right - I missed it. Andrea, Please open a bug at bugzilla (https://bugs.openfabrics.org) - so that you will be notified as soon as I will fix SDP not use FMR if not supported. As to fastreg_mrs support - I don't know this mechanism. Do you mean FRWR? Thanks, Amir On 04/14/2010 05:54 PM, Steve Wise wrote: > Hey Amir, > > I don't think this helps because sdp_add_device() will not add rdma > devices that fail to create fmr pools. > > So I guess you could key off of fmr pool failures and set > sdp_zcopy_thresh to 0 and allow the device to be used? > > But what we really need is sdp support for fastreg_mrs as an > alternative to fmrs. > > > Steve. > > > Amir Vadai wrote: > >> Hi, >> >> FMR are being used only in a special mode called ZCopy. >> >> You could disable this mode by setting the module paramter >> sdp_zcopy_thresh to 0, or by issuing: >> # echo 0 > /sys/module/ib_sdp/parameters/sdp_zcopy_thresh >> >> This means that you won't get the benefits of Zero-copy. >> >> - Amir >> >> On 04/14/2010 11:51 AM, Andrea Gozzelino wrote: >> >> >>> On Apr 13, 2010 10:22 PM, "Tung, Chien Tin" >>> wrote: >>> >>> >>> >>> >>>>>>> Chien, does the NE020 support FMRs? I looked at the nes ofed-1.5 >>>>>>> code >>>>>>> and it appears to do nothing in the map_phys_fmr functions. >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>> We never implemented map_phys_fmr. Is it relevant to the # of SGEs? >>>>>> >>>>>> >>>>>> >>>>>> >>>>> No, but SDP uses FMRs. I don't think it will run without FMR support. >>>>> >>>>> >>>>> >>>>> >>>> Good to know. Thanks. >>>> >>>> Chien >>>> >>>> >>>> >>>> >>>> >>> Hi Steve and Chien, >>> >>> I understand that NE020 cards have problem with SDP connected with >>> map_phy_fmr (FMR stands for Fast Memory Region). >>> Is it possible to solve/fix this point? >>> If yes, have you an idea about the time that is necessary to code >>> development/build? >>> If no, can you suggest me a card that supports SDP protocol? >>> >>> I work on NE020 cards from February 2010 for an INFN experimental >>> proposal, called REDIGO (Read out at 10 Gbits/s), about the data >>> acquisition and movement systems. The covergence of storage protocols >>> around 10 Gigabits/s Ethernet protocols shows that one way could be the >>> Remote Direct Memory Access (RDMA). The goals are the investigations of >>> latency time, the throughput, the buffer size schemes and finally the >>> global event building bandwidth. >>> >>> Do you know if NE020 cards have problems with librdma (RDMA procedures, >>> in general) and / or with MPI versions? >>> >>> Thank you very much, >>> Andrea >>> >>> Andrea Gozzelino >>> >>> INFN - Laboratori Nazionali di Legnaro (LNL) >>> Viale dell'Universita' 2 >>> I-35020 - Legnaro (PD)- ITALIA >>> Tel: +39 049 8068346 >>> Fax: +39 049 641925 >>> Mail: andrea.gozzelino-PK20h7lG/Rc1GQ1Ptb7lUw@public.gmane.org >>> >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in >>> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >>> >>> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> Please read the FAQ at http://www.tux.org/lkml/ >> >> > > -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html