forked from Minki/linux
[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: Mark Haverkamp <markh@osdl.org> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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@ -531,6 +531,13 @@ struct aac_driver_ident
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*/
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#define AAC_QUIRK_MASTER 0x0008
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/*
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* Some adapter firmware perform poorly when it must split up scatter gathers
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* in order to deal with the limits of the underlying CHIM. This limit in this
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* class of adapters is 17 scatter gather elements.
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*/
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#define AAC_QUIRK_17SG 0x0010
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/*
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* The adapter interface specs all queues to be located in the same
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* physically contigous block. The host structure that defines the
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@ -200,10 +200,10 @@ static struct aac_driver_ident aac_drivers[] = {
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{ aac_rkt_init, "aacraid", "ADAPTEC ", "Callisto ", 2, AAC_QUIRK_MASTER }, /* Jupiter Platform */
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{ aac_rx_init, "aacraid", "ADAPTEC ", "ASR-2020SA ", 1 }, /* ASR-2020SA SATA PCI-X ZCR (Skyhawk) */
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{ aac_rx_init, "aacraid", "ADAPTEC ", "ASR-2025SA ", 1 }, /* ASR-2025SA SATA SO-DIMM PCI-X ZCR (Terminator) */
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{ aac_rx_init, "aacraid", "ADAPTEC ", "AAR-2410SA SATA ", 1 }, /* AAR-2410SA PCI SATA 4ch (Jaguar II) */
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{ aac_rx_init, "aacraid", "DELL ", "CERC SR2 ", 1 }, /* CERC SATA RAID 2 PCI SATA 6ch (DellCorsair) */
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{ aac_rx_init, "aacraid", "ADAPTEC ", "AAR-2810SA SATA ", 1 }, /* AAR-2810SA PCI SATA 8ch (Corsair-8) */
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{ aac_rx_init, "aacraid", "ADAPTEC ", "AAR-21610SA SATA", 1 }, /* AAR-21610SA PCI SATA 16ch (Corsair-16) */
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{ aac_rx_init, "aacraid", "ADAPTEC ", "AAR-2410SA SATA ", 1, AAC_QUIRK_17SG }, /* AAR-2410SA PCI SATA 4ch (Jaguar II) */
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{ aac_rx_init, "aacraid", "DELL ", "CERC SR2 ", 1, AAC_QUIRK_17SG }, /* CERC SATA RAID 2 PCI SATA 6ch (DellCorsair) */
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{ aac_rx_init, "aacraid", "ADAPTEC ", "AAR-2810SA SATA ", 1, AAC_QUIRK_17SG }, /* AAR-2810SA PCI SATA 8ch (Corsair-8) */
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{ aac_rx_init, "aacraid", "ADAPTEC ", "AAR-21610SA SATA", 1, AAC_QUIRK_17SG }, /* AAR-21610SA PCI SATA 16ch (Corsair-16) */
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{ aac_rx_init, "aacraid", "ADAPTEC ", "ASR-2026ZCR ", 1 }, /* ESD SO-DIMM PCI-X SATA ZCR (Prowler) */
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{ aac_rx_init, "aacraid", "ADAPTEC ", "AAR-2610SA ", 1 }, /* SATA 6Ch (Bearcat) */
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{ aac_rx_init, "aacraid", "ADAPTEC ", "ASR-2240S ", 1 }, /* ASR-2240S (SabreExpress) */
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@ -853,6 +853,13 @@ static int __devinit aac_probe_one(struct pci_dev *pdev,
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= (aac->scsi_host_ptr->sg_tablesize * 8) + 112;
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}
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if ((aac_drivers[index].quirks & AAC_QUIRK_17SG) &&
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(aac->scsi_host_ptr->sg_tablesize > 17)) {
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aac->scsi_host_ptr->sg_tablesize = 17;
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aac->scsi_host_ptr->max_sectors
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= (aac->scsi_host_ptr->sg_tablesize * 8) + 112;
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}
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/*
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* Firware printf works only with older firmware.
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*/
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