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];
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