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[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>
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@ -925,7 +925,7 @@ int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
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set_buffer_new(bh_result);
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got_it:
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map_bh(bh_result, inode->i_sb, le32_to_cpu(chain[depth-1].key));
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if (blocks_to_boundary == 0)
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if (count > blocks_to_boundary)
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set_buffer_boundary(bh_result);
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err = count;
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/* Clean up and exit */
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