• Suparna Bhattacharya's avatar
    [PATCH] ext3 sequential read regression fix · 20acaa18
    Suparna Bhattacharya authored
    ext3-get-blocks support caused ~20% degrade in Sequential read
    performance (tiobench). Problem is with marking the buffer boundary
    so IO can be submitted right away. Here is the patch to fix it.
    
      2.6.18-rc6:
      -----------
      # ./iotest
      1048576+0 records in
      1048576+0 records out
      4294967296 bytes (4.3 GB) copied, 75.2726 seconds, 57.1 MB/s
    
      real    1m15.285s
      user    0m0.276s
      sys     0m3.884s
    
      2.6.18-rc6 + fix:
      -----------------
      [root@elm3a241 ~]# ./iotest
      1048576+0 records in
      1048576+0 records out
      4294967296 bytes (4.3 GB) copied, 62.9356 seconds, 68.2 MB/s
    
    The boundary block check in ext3_get_blocks_handle needs to be adjusted
    against the count of blocks mapped in this call, now that it can map
    more than one block.
    Signed-off-by: default avatarSuparna Bhattacharya <suparna@in.ibm.com>
    Tested-by: default avatarBadari Pulavarty <pbadari@us.ibm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    20acaa18
inode.c 93.6 KB