IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

NETFINITY 5000: PEER to PEER ADAPTER CARD PERFORMANCE

    Record number:       H165124
    Device:              D/T8659
    Model:               M
    Hit count:           UHC00000
    Success count:       USC0000
    Publication code:    PC50
    Tip key:
    Date created:        O98/11/02
    Date last altered:   A98/11/02
    Owning B.U.:         USA


Abstract: NETFINITY 5000: PEER to PEER ADAPTER CARD PERFORMANCE

SYMPTOM:

If a card which uses Peer-to-Peer PCI Bus Mastering is used in a Netfinity 5000 sever system, performance might be much lower than expected.

PROBLEM ISOLATION AIDS:

•  The system is a Netfinity 5000 server, Type 8659, any Model.
•  The system is configured with a compatible PCI adapter that uses Peer-to-Peer PCI Bus Mastering.

FIX:

It is strongly recommended that both the master and the card it is accessing are installed in the same PCI bus.
Practically this means that they should be in slots 1-4 as slot 5 is on a different bus.
If this advice is not followed, performance will be very seriously affected, and some data corruption may theoretically occur (though none has been observed in any adapters that have been tested).

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