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Date:      Thu, 20 Jun 1996 20:48:02 +0200 (MET DST)
From:      J Wunsch <j@uriah.heep.sax.de>
To:        bde@zeta.org.au (Bruce Evans)
Cc:        gwk@cray.com, bde@zeta.org.au, freebsd-bugs@freefall.freebsd.org, gpalmer@FreeBSD.org, dyson@FreeBSD.org, davidg@FreeBSD.org (David Greenman)
Subject:   Re: bin/1320: dump limits blocksize to 32K
Message-ID:  <199606201848.UAA17515@uriah.heep.sax.de>
In-Reply-To: <199606191248.WAA16277@godzilla.zeta.org.au> from Bruce Evans at "Jun 19, 96 10:48:51 pm"

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As Bruce Evans wrote:

> >It splits the request into 64 KB chunks, so it can handle them.  This
> >works mostly except for tapes, which are IMHO the only devices that
> >might require a physical blocksize larger than 64 KB
> 
> physio() needs to have a no-split flag that would be set by the tape
> drivers.

I would rather like to see the problem resolved once and for all.
This will however require some ``bounce buffer'' support, at least for
those controllers that can only handle 16 scatter/gather segments
(thus 16 physical pages == 64 KB).

David?  John?  Any opinion about this?

-- 
cheers, J"org

joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)



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