Subject: Re: Extension of fsync_range() to permit forcing disk cache flushing
To: None <tls@rek.tjls.com>
From: Jason Thorpe <thorpej@shagadelic.org>
List: tech-kern
Date: 12/18/2004 11:38:10
--Apple-Mail-1-537439158
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=US-ASCII; format=flowed


On Dec 17, 2004, at 2:06 PM, Thor Lancelot Simon wrote:

> With newer SATA disks, *if we supported tagged command queueing*, which
> we don't, and only with controllers that actually supported it, we 
> could
> do the right thing here.

Don't assume that SATA NCQ is a panacea.  It is still not as good as 
SCSI tagged queueing (where you have mode pages that allow you to tune 
various aspects of how the drive's queue is managed).

         -- Jason R. Thorpe <thorpej@shagadelic.org>


--Apple-Mail-1-537439158
content-type: application/pgp-signature; x-mac-type=70674453;
	name=PGP.sig
content-description: This is a digitally signed message part
content-disposition: inline; filename=PGP.sig
content-transfer-encoding: 7bit

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.3 (Darwin)

iD8DBQFBxIcmOpVKkaBm8XkRAonVAKDVVoSJ7lmLqlohJclwW37uFDW+2QCffTt/
10dlOkSU4rufmc+5E0wZJng=
=Yhjg
-----END PGP SIGNATURE-----

--Apple-Mail-1-537439158--