diff options
| author |   Fengnan Chang <changfengnan@vivo.com> | 2021-10-22 20:08:00 -0700 |
|---|---|---|
| committer |   Jaegeuk Kim <jaegeuk@kernel.org> | 2021-10-26 14:04:31 -0700 |
| commit | b368cc5e26341113453e7458f03cdfe0eeb84a40 (patch) | |
| tree | e4164fd66d5fd80b12188b193c662401b220f399 /drivers/fpga/fpga-mgr.c | |
| parent | f2fs: multidevice: support direct IO (diff) | |
| download | linux-dev-b368cc5e26341113453e7458f03cdfe0eeb84a40.tar.xz linux-dev-b368cc5e26341113453e7458f03cdfe0eeb84a40.zip | |
f2fs: compress: fix overwrite may reduce compress ratio unproperly
when overwrite only first block of cluster, since cluster is not full, it
will call f2fs_write_raw_pages when f2fs_write_multi_pages, and cause the
whole cluster become uncompressed eventhough data can be compressed.
this may will make random write bench score reduce a lot.
root# dd if=/dev/zero of=./fio-test bs=1M count=1
root# sync
root# echo 3 > /proc/sys/vm/drop_caches
root# f2fs_io get_cblocks ./fio-test
root# dd if=/dev/zero of=./fio-test bs=4K count=1 oflag=direct conv=notrunc
w/o patch:
root# f2fs_io get_cblocks ./fio-test
189
w/ patch:
root# f2fs_io get_cblocks ./fio-test
192
Signed-off-by: Fengnan Chang <changfengnan@vivo.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'drivers/fpga/fpga-mgr.c')
0 files changed, 0 insertions, 0 deletions