Subject: Re: Single file system (buf) read size
To: =?iso-8859-1?Q?P=E5l_Halvorsen?= <>
From: Chuck Silvers <>
List: tech-kern
Date: 03/12/2001 22:19:38
there's the MAXPHYS constant that you should bump up to the maximum i/o size
you want to use.  I wouldn't be surprised if you ran into trouble though,
since I imagine hardly anyone tests drivers with an increased MAXPHYS.


On Mon, Mar 12, 2001 at 09:58:50AM +0100, Pål Halvorsen wrote:
> Hi!
> Can a single call to the a disk driver request more than 64 KB of data,
> i.e., can the buf structure hold more than 64 KB of data if the amount of 
> memory is available (buf.b_data points to a memory region > 64 KB)?
> (For example if data is stored mostly contiguous on disk and we are able
> to read 128 KB contiguously)
> Thank you for your help,
> -ph