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[SCSI] aacraid: 17 element sg performance update

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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>
This commit is contained in:
Mark Haverkamp
2006-01-11 09:28:29 -08:00
committed by James Bottomley
parent 7686f13265
commit db39363c02
2 changed files with 18 additions and 4 deletions
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7
drivers/scsi/aacraid/aacraid.h
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@@ -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