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authorMark Haverkamp <markh@osdl.org>2006-01-11 12:28:29 -0500
committerJames Bottomley <jejb@mulgrave.(none)>2006-01-12 12:55:01 -0500
commitdb39363c029cd9e74661ef059a17785d1c62a851 (patch)
tree68fa6ae11b646103cc5a115400dc753a04ef2c43 /drivers/scsi/aacraid/aacraid.h
parent7686f132653fa3d52d45c3f021215f714094f1ca (diff)
[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>
Diffstat (limited to 'drivers/scsi/aacraid/aacraid.h')
-rw-r--r--drivers/scsi/aacraid/aacraid.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index 30fd8d6e3f31..66dbb6d2c506 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -532,6 +532,13 @@ struct aac_driver_ident
532#define AAC_QUIRK_MASTER 0x0008 532#define AAC_QUIRK_MASTER 0x0008
533 533
534/* 534/*
535 * Some adapter firmware perform poorly when it must split up scatter gathers
536 * in order to deal with the limits of the underlying CHIM. This limit in this
537 * class of adapters is 17 scatter gather elements.
538 */
539#define AAC_QUIRK_17SG 0x0010
540
541/*
535 * The adapter interface specs all queues to be located in the same 542 * The adapter interface specs all queues to be located in the same
536 * physically contigous block. The host structure that defines the 543 * physically contigous block. The host structure that defines the
537 * commuication queues will assume they are each a separate physically 544 * commuication queues will assume they are each a separate physically