[comp.sys.nsc.32k] Sanity Check ...

news@daver.bungi.com (09/23/90)

An addition thought I forgot to include in my previous message today.

>> By the way, the hold-off at least wrt tape reads, appears at the 
>> very beginning of each 'datain' phase and during streaming breaks.

> I would have hoped that the tape would only interrupt (via scsi) when the
> data was 'really' ready to be read. Is this an embedded controller type with
> a reasonable local buffer or a 'dumb' external controller?

Standing back, its not clear to me at the moment that efficient use of
interrupts will in this instance increase disk-to-tape or tape-to-disk 
throughput under Minix.  With or without interrupts, the FS process 
will remain blocked until the device driver task completes.  Of course, 
avoiding prolonged assertion of /nrdy or busy waits by prudent use of 
interrupts will permit other scheduled processes to run in the mean time.

best regards,
johnc

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