Commit db39363c authored by Mark Haverkamp's avatar Mark Haverkamp Committed by James Bottomley
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[SCSI] aacraid: 17 element sg performance update 



Received From Mark Salyzyn.

The Jaguar and Corsair class of adapters (2410, 2810, 2610, 21610, CERC)
perform better (about 10% better read performance, write performance
neutral) with current Firmware if the OS limits the number of scatter
gather elements to 17 per request.

Signed-off-by: default avatarMark Haverkamp <markh@osdl.org>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 7686f132

drivers/scsi/aacraid/aacraid.h

+7 −0
Original line number Diff line number Diff line
@@ -531,6 +531,13 @@ struct aac_driver_ident 
 */

#define AAC_QUIRK_MASTER 0x0008



/*

 * Some adapter firmware perform poorly when it must split up scatter gathers

 * in order to deal with the limits of the underlying CHIM. This limit in this

 * class of adapters is 17 scatter gather elements.

 */

#define AAC_QUIRK_17SG	0x0010



/*

 *	The adapter interface specs all queues to be located in the same

 *	physically contigous block. The host structure that defines the

drivers/scsi/aacraid/linit.c

+11 −4
Original line number Diff line number Diff line
@@ -200,10 +200,10 @@ static struct aac_driver_ident aac_drivers[] = { 
	{ aac_rkt_init, "aacraid",  "ADAPTEC ", "Callisto        ", 2, AAC_QUIRK_MASTER }, /* Jupiter Platform */

	{ aac_rx_init, "aacraid",  "ADAPTEC ", "ASR-2020SA       ", 1 }, /* ASR-2020SA SATA PCI-X ZCR (Skyhawk) */

	{ aac_rx_init, "aacraid",  "ADAPTEC ", "ASR-2025SA       ", 1 }, /* ASR-2025SA SATA SO-DIMM PCI-X ZCR (Terminator) */

	{ aac_rx_init, "aacraid",  "ADAPTEC ", "AAR-2410SA SATA ", 1 }, /* AAR-2410SA PCI SATA 4ch (Jaguar II) */

	{ aac_rx_init, "aacraid",  "DELL    ", "CERC SR2        ", 1 }, /* CERC SATA RAID 2 PCI SATA 6ch (DellCorsair) */

	{ aac_rx_init, "aacraid",  "ADAPTEC ", "AAR-2810SA SATA ", 1 }, /* AAR-2810SA PCI SATA 8ch (Corsair-8) */

	{ aac_rx_init, "aacraid",  "ADAPTEC ", "AAR-21610SA SATA", 1 }, /* AAR-21610SA PCI SATA 16ch (Corsair-16) */

	{ aac_rx_init, "aacraid",  "ADAPTEC ", "AAR-2410SA SATA ", 1, AAC_QUIRK_17SG }, /* AAR-2410SA PCI SATA 4ch (Jaguar II) */

	{ aac_rx_init, "aacraid",  "DELL    ", "CERC SR2        ", 1, AAC_QUIRK_17SG }, /* CERC SATA RAID 2 PCI SATA 6ch (DellCorsair) */

	{ aac_rx_init, "aacraid",  "ADAPTEC ", "AAR-2810SA SATA ", 1, AAC_QUIRK_17SG }, /* AAR-2810SA PCI SATA 8ch (Corsair-8) */

	{ aac_rx_init, "aacraid",  "ADAPTEC ", "AAR-21610SA SATA", 1, AAC_QUIRK_17SG }, /* AAR-21610SA PCI SATA 16ch (Corsair-16) */

	{ aac_rx_init, "aacraid",  "ADAPTEC ", "ASR-2026ZCR     ", 1 }, /* ESD SO-DIMM PCI-X SATA ZCR (Prowler) */

	{ aac_rx_init, "aacraid",  "ADAPTEC ", "AAR-2610SA      ", 1 }, /* SATA 6Ch (Bearcat) */

	{ aac_rx_init, "aacraid",  "ADAPTEC ", "ASR-2240S       ", 1 }, /* ASR-2240S (SabreExpress) */
@@ -853,6 +853,13 @@ static int __devinit aac_probe_one(struct pci_dev *pdev, 
 		  = (aac->scsi_host_ptr->sg_tablesize * 8) + 112;

 	}



 	if ((aac_drivers[index].quirks & AAC_QUIRK_17SG) &&

			(aac->scsi_host_ptr->sg_tablesize > 17)) {

 		aac->scsi_host_ptr->sg_tablesize = 17;

 		aac->scsi_host_ptr->max_sectors

 		  = (aac->scsi_host_ptr->sg_tablesize * 8) + 112;

 	}



	/*

	 * Firware printf works only with older firmware.

	 */

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