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Date:      Thu, 29 Jan 1998 09:01:50 -0700
From:      "Justin T. Gibbs" <gibbs@plutotech.com>
To:        Bruce Evans <bde@zeta.org.au>
Cc:        mike@smith.net.au, cvs-all@FreeBSD.ORG, cvs-committers@FreeBSD.ORG, cvs-sys@FreeBSD.ORG
Subject:   Re: cvs commit: src/sys/i386/isa wfd.c 
Message-ID:  <199801291604.JAA05105@pluto.plutotech.com>
In-Reply-To: Your message of "Fri, 30 Jan 1998 02:44:28 %2B1100." <199801291544.CAA01875@godzilla.zeta.org.au> 

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>Some of them can only can only handle 16 scatter-gather segments, so
>they can only handle transfer sizes <= 64K, which is currently MAXPHYS/2.
>They are never asked to handle > 64K because filesystem block sizes are
>limited to MAXBSIZE = 64K and raw i/o sizes are limited to DFLTPHYS = 64K.

And may not be able to handle even 64k if the raw I/O is not page aligned.

>Bruce

--
Justin





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