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| author | Suparna Bhattacharya <suparna@in.ibm.com> | 2006-09-16 12:15:58 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-16 12:54:32 -0700 |
| commit | 20acaa18d0c002fec180956f87adeb3f11f635a6 (patch) | |
| tree | 2cd2f21530150e8248a0217e380d58d42e79d89d /drivers | |
| parent | e4b69aa2a1bcee21f8d5e089b8682dd8aaace5eb (diff) | |
| download | linux-20acaa18d0c002fec180956f87adeb3f11f635a6.tar.gz | |
[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>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions