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From: Alexander Motin <mav@FreeBSD.org>
Date: Tue, 8 Jun 2010 10:03:08 +0000 (UTC)
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Subject: svn commit: r208907 - head/sys/dev/ahci
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Author: mav
Date: Tue Jun  8 10:03:08 2010
New Revision: 208907
URL: http://svn.freebsd.org/changeset/base/208907

Log:
  Disable NCQ and PMP support for VIA VT8251 AHCI. It was reported to be
  unreliable under load. Linux does the same.

Modified:
  head/sys/dev/ahci/ahci.c

Modified: head/sys/dev/ahci/ahci.c
==============================================================================
--- head/sys/dev/ahci/ahci.c	Tue Jun  8 07:49:02 2010	(r208906)
+++ head/sys/dev/ahci/ahci.c	Tue Jun  8 10:03:08 2010	(r208907)
@@ -239,8 +239,8 @@ static struct {
 	{0x0d8d10de, 0x00, "NVIDIA MCP89",	AHCI_Q_NOAA},
 	{0x0d8e10de, 0x00, "NVIDIA MCP89",	AHCI_Q_NOAA},
 	{0x0d8f10de, 0x00, "NVIDIA MCP89",	AHCI_Q_NOAA},
-	{0x33491106, 0x00, "VIA VT8251",	0},
-	{0x62871106, 0x00, "VIA VT8251",	0},
+	{0x33491106, 0x00, "VIA VT8251",	AHCI_Q_NOPMP|AHCI_Q_NONCQ},
+	{0x62871106, 0x00, "VIA VT8251",	AHCI_Q_NOPMP|AHCI_Q_NONCQ},
 	{0x11841039, 0x00, "SiS 966",		0},
 	{0x11851039, 0x00, "SiS 968",		0},
 	{0x01861039, 0x00, "SiS 968",		0},