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| author | Suparna Bhattacharya <suparna@in.ibm.com> | 2006-09-16 21:15:58 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-16 21:54:32 +0200 |
| commit | 20acaa18d0c002fec180956f87adeb3f11f635a6 (patch) | |
| tree | 2cd2f21530150e8248a0217e380d58d42e79d89d | |
| parent | [PATCH] bug fix in kernel/kmod.c (diff) | |
| download | linux-20acaa18d0c002fec180956f87adeb3f11f635a6.tar.xz linux-20acaa18d0c002fec180956f87adeb3f11f635a6.zip | |
[PATCH] ext3 sequential read regression fix
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: Suparna Bhattacharya <suparna@in.ibm.com>
Tested-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | fs/ext3/inode.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c index 0f0b1eadb98d..84be02e93652 100644 --- a/fs/ext3/inode.c +++ b/fs/ext3/inode.c @@ -925,7 +925,7 @@ int ext3_get_blocks_handle(handle_t *handle, struct inode *inode, set_buffer_new(bh_result); got_it: map_bh(bh_result, inode->i_sb, le32_to_cpu(chain[depth-1].key)); - if (blocks_to_boundary == 0) + if (count > blocks_to_boundary) set_buffer_boundary(bh_result); err = count; /* Clean up and exit */ |