lustre/kernel_patches/patches/blkdev_tunables-2.6-rhel6.patch

   1 Index: b/include/linux/blkdev.h
   2 ===================================================================
   3 --- a/include/linux/blkdev.h
   4 +++ b/include/linux/blkdev.h
   5 @@ -1026,6 +1026,6 @@ extern int blk_verify_command(unsigned c
   6  enum blk_default_limits {
   7 -       BLK_MAX_SEGMENTS        = 128,
   8 +       BLK_MAX_SEGMENTS        = 256,
   9         BLK_SAFE_MAX_SECTORS    = 255,
  10 -       BLK_DEF_MAX_SECTORS     = 1024,
  11 +       BLK_DEF_MAX_SECTORS     = 2048,
  12         BLK_MAX_SEGMENT_SIZE    = 65536,
  13         BLK_SEG_BOUNDARY_MASK   = 0xFFFFFFFFUL,
  14  };
  15 Index: linux-2.6.32.x86_64/include/scsi/scsi.h
  16 ===================================================================
  17 --- linux-2.6.32.x86_64.orig/include/scsi/scsi.h        2010-10-26 21:45:52.000000000 +0300
  18 +++ linux-2.6.32.x86_64/include/scsi/scsi.h     2010-10-29 11:16:35.000000000 +0300
  19 @@ -19,7 +19,7 @@ struct scsi_cmnd;
  20   * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order.  The
  21   * minimum value is 32
  22   */
  23 -#define SCSI_MAX_SG_SEGMENTS   128
  24 +#define SCSI_MAX_SG_SEGMENTS   256
  25
  26  /*
  27   * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
  28 Index: linux-2.6.32.x86_64/drivers/scsi/isci/init.c
  29 ===================================================================
  30 --- linux-2.6.32.x86_64/drivers/scsi/isci/init.c
  31 +++ linux-2.6.32.x86_64/drivers/scsi/isci/init.c
  32 @@ -19,7 +19,7 @@
  33         .can_queue                      = ISCI_CAN_QUEUE_VAL,
  34         .cmd_per_lun                    = 1,
  35         .this_id                        = -1,
  36 -       .sg_tablesize                   = SG_ALL,
  37 +       .sg_tablesize                   = 128,
  38         .max_sectors                    = SCSI_DEFAULT_MAX_SECTORS,
  39         .use_clustering                 = ENABLE_CLUSTERING,
  40         .eh_device_reset_handler        = sas_eh_device_reset_handler,