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From: Anton Yuzhaninov <citrin@citrin.ru>
Date: Thu, 24 Mar 2011 14:38:00 +0000 (UTC)
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Subject: Re: how to enable NCQ on Intel ESB2 AHCI
	SATA?controller/ST31000340NS
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On Wed, 23 Mar 2011 16:37:11 -0500, Dan Nelson wrote:
DN> If you do a verbose boot, you should get a couple more lines printed:
DN> 
DN> ahci0: Caps: 64bit NCQ SNTF AL CLO 3Gbps PM PMD SSC PSC 32cmd CCC EM 6ports
DN> ahci0: Caps2:
DN> ahci0: EM Caps: ALHD XMT SMB LED
DN> 
DN> If you see NCQ in your Caps line, then queueing should be supported by the
DN> controller.  Looking at the ahci.c source, there is a quirk "AHCI_Q_NONCQ"
DN> that disables NCQ, but it it only used for VIA VT8251 chips.

It seems to be NCQ not supported by this controller:
ahci0: AHCI v1.10 with 6 3Gbps ports, Port Multiplier supported
ahci0: Caps: 64bit ALP AL 3Gbps PM SSC PSC 32cmd 6ports
ahci0: Caps2:

-- 
WBR,
 Anton Yuzhaninov