Subject: Re: KVA usage of old-style buffers
To: Chuck Silvers <>
From: Thor Lancelot Simon <>
List: tech-kern
Date: 10/02/2001 13:50:47
On Mon, Oct 01, 2001 at 07:52:58PM -0700, Chuck Silvers wrote:
> putting an upper bound on the amount of KVA used for buffers
> is a fine thing for now, for all ports, especially ones that
> can have large amounts of RAM or that have less KVA to begin with.
> eventually it would be good to enhance the buffer cache to be
> more efficient in its use of KVA, but that isn't critical yet.

Does UBC use MAXBSIZE or MAXPHYS to limit the size of transfers it
hands to drivers?  If it uses MAXPHYS, we could (correctly) reduce
MAXBSIZE and thus address this problem.

Thor Lancelot Simon	                            
    And now he couldn't remember when this passion had flown, leaving him so
  foolish and bewildered and astray: can any man?
						   William Styron