The patch titled
ext3 sequential read regression fix
has been added to the -mm tree. Its filename is
ext3-sequential-read-regression-fix.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: ext3 sequential read regression fix
From: Badari Pulavarty <pbadari@xxxxxxxxxx>
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@xxxxxxxxxx>
Tested-by: Badari Pulavarty <pbadari@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/ext3/inode.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN fs/ext3/inode.c~ext3-sequential-read-regression-fix fs/ext3/inode.c
--- a/fs/ext3/inode.c~ext3-sequential-read-regression-fix
+++ a/fs/ext3/inode.c
@@ -925,7 +925,7 @@ int ext3_get_blocks_handle(handle_t *han
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 */
_
Patches currently in -mm which might be from pbadari@xxxxxxxxxx are
ext3-sequential-read-regression-fix.patch
jbd-fix-commit-of-ordered-data-buffers.patch
pass-io-size-to-batch_write-address-space-operation.patch
vectorize-aio_read-aio_write-fileop-methods.patch
vectorize-aio_read-aio_write-fileop-methods-xfs-fix.patch
vectorize-aio_read-aio_write-fileop-methods-hypfs-fix.patch
remove-readv-writev-methods-and-use-aio_read-aio_write.patch
streamline-generic_file_-interfaces-and-filemap.patch
add-vector-aio-support.patch
add-vector-aio-support-fix.patch
streamline-generic_file_-interfaces-and-filemap-ecryptfs.patch
-
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