Re: Some NCQ numbers...

On Thu, Jun 28, 2007 at 02:51:58PM +0400, Michael Tokarev wrote:

[..]
Test machine was using MPTSAS driver for the following card:
  SCSI storage controller: LSI Logic / Symbios Logic SAS1064E PCI-Express Fusion-MPT SAS (rev 02)

Pretty similar results were obtained on an AHCI controller:
  SATA controller: Intel Corporation 82801GR/GH (ICH7 Family) Serial ATA Storage Controller AHCI (rev 01)
on another machines.

Are you sure that NCQ was enabled between the controller and drive? 
Did you verify this? I know about some versions that disable NCQ 
support internally in their firmware (something to do with bugs in
error handling).

-- 
Dan Aloni
XIV LTD, http://www.xivstorage.com
da-x (at) monatomic.org, dan (at) xiv.co.il