Conference 7.286::fddi

1860.0. "DEFPA, Alpha and Multiprocessors question" by ANOHAC::COMFORT (The river keeps a talkin') Tue Nov 07 1995 13:25

    
    Hi,
    
    I'm not sure what conference is best to start this topic, or if I will
    get anywhere with it...so
    
    Alpha 2100 running OVMS 6.1 w/ the DEFPA drivers and manual connection
    procedure in place.  When the Alpha systems are configured for a single
    CPU, the performance of the DEFPA-AA is fine.  Can soak right up to
    wire speed (or in this case, glass speed), around 11-12 MB/sec.  When we
    put a second cpu in the mix, the receive performance on the DEFPA drops
    to about 300 KBytes/sec, though the transmit performance remains
    consistent.  Additionally, the performance problem internittently
    disappears on a given transfer.  The overall pattern seems to be 3-4
    poor receive performance trials followed by one or two at the
    appropriate throughput, then back to low performance.
    
    Anyone seen this or have a new driver, etc.
    
    Thanks,
    
    Dave Comfort
    

    
    Dave,
    
    	I assume you've opened call with Colorado about this?
    
    	What do you mean by manual connection procedure?
    
    Thanks,
    Ted

    
    Ted -
    
    The manual connection procedure is to provide a io connection for the
    device driver via sysman.  OVMS 6.1 does not have integrated support
    for the DEFPA, but a driver and installation procedure kit is
    available.
    
    Dave

There's no known problem with the driver in this regard.  I'd look at
system tuning, amount of non-paged pool, and what the test program and
look at counters to see whats going on.  

- Dick

    
    Does this system have the Performance Solution product running on it?
    
    This might help you to answer some of Dick's (.3) questions...