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    SubjectRe: Socket Direct Protocol: help (2)
    One more thing - Please open a bug regarding the num_sge limitation at:
    https://bugs.openfabrics.org/

    Thanks,
    Amir

    On 04/14/2010 05:31 PM, 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" <chien.tin.tung@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.gozzelino@lnl.infn.it
    >>
    >> --
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    >>
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