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f2fs: fix to write node pages with WRITE_SYNC 

This patch fixes performance regression of dbench reported by
Alex <hbx7d@yandex.com>.

This issue was revealed by Phoronix tests results:
http://www.phoronix.com/scan.php?page=article&item=linux_314_ssdfs&num=2

It turns out that we need to assign WRITE_SYNC to the node writes, if
fsync is triggered.

The performance numbers are like below, which is measured by Alex.
1. 355MB/s       ext4
2. 225MB/s       f2fs : WRITE for node writes
3. 525MB/s       f2fs : WRITE_SYNC for node writes

Reported-And-Tested-by: Alex <hbx7d@yandex.com>.
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2014-03-03 11:28:40 +09:00
parent 9cf3c3898a
commit c81bf1c84f
1 changed files with 1 additions and 1 deletions
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2
fs/f2fs/file.c
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@ -115,7 +115,7 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
int ret = 0; int ret = 0;
bool need_cp = false; bool need_cp = false;
struct writeback_control wbc = { struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE, .sync_mode = WB_SYNC_ALL,
.nr_to_write = LONG_MAX, .nr_to_write = LONG_MAX,
.for_reclaim = 0, .for_reclaim = 0,
}; };