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" <chien.tin.t...@intel.com> > 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.gozzel...@lnl.infn.it > > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html