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From: nett@orac.UUCP (Jerry Nettleton)
Newsgroups: comp.sys.hp
Subject: max length of 'uiomove' transfer (HP9000/400 or 700)
Message-ID: <365@orac.UUCP>
Date: 10 Jun 91 06:18:59 GMT
Article-I.D.: orac.365
Organization: Technix Inc, St. Paul, MN, USA
Lines: 17

As far as I can determine, the 'uiomove' kernel call seems to be
limited to a maximum length of 128 KB.  I am currently using a
HP9000/400 machine and expect to move the source code to the 700
series.  The size limitations are not documented in the manual and I
was wondering if there would be any problem (side effects) of using
128 KB size.  Is there the same limitation on the Snake (700)?  The
driver I'm working supports a maximum memory page size of 1 MB and
larger transfer are preferred.

While thinking of uiomove, does anyone know if the underlying
routines, copyin and copyout, are optimized to use 32-bit word
transfers?

Thanks,
-- 
Jerry Nettleton
email: ...!uunet!cs.umn.edu!kksys!edgar!orac!nett