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From: Alexander Motin <mav@FreeBSD.org>
Date: Fri, 3 Jun 2011 07:25:37 +0000 (UTC)
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Subject: svn commit: r222643 - head/sys/cam/ata
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Author: mav
Date: Fri Jun  3 07:25:36 2011
New Revision: 222643
URL: http://svn.freebsd.org/changeset/base/222643

Log:
  Increase maximum supported number of ranges per TRIM command from 256 to 512
  to use full potential of Intel X25-M SSDs. On synthetic test with 32K ranges
  it gives about 20% speedup, which probably costs more then 2K of RAM.

Modified:
  head/sys/cam/ata/ata_da.c

Modified: head/sys/cam/ata/ata_da.c
==============================================================================
--- head/sys/cam/ata/ata_da.c	Fri Jun  3 06:58:24 2011	(r222642)
+++ head/sys/cam/ata/ata_da.c	Fri Jun  3 07:25:36 2011	(r222643)
@@ -114,9 +114,9 @@ struct disk_params {
 	u_int64_t sectors;	/* Total number sectors */
 };
 
-#define TRIM_MAX_BLOCKS	4
+#define TRIM_MAX_BLOCKS	8
 #define TRIM_MAX_RANGES	(TRIM_MAX_BLOCKS * 64)
-#define TRIM_MAX_BIOS	(TRIM_MAX_RANGES * 8)
+#define TRIM_MAX_BIOS	(TRIM_MAX_RANGES * 4)
 struct trim_request {
 	uint8_t		data[TRIM_MAX_RANGES * 8];
 	struct bio	*bps[TRIM_MAX_BIOS];