Re: [PATCH] md/raid5: Add compensation in sysfs for raid456.
From: Michael Tokarev <hidden>
Date: 2014-01-14 10:00:18
14.01.2014 09:40, majianpeng wrote:
For non-fullstripe-write, raid456 need read some old data no matter how rcw or rmw. We use compensation to recored the value about the additional read-data.The unit of compenstaion is PAGE_SIZE. Using the formula compensation*PAGE_SIZE/write_count_for_md, we can know the efficiency.Using this we can tune the write mode to get the best efficiency.
Just a very small nitpick:
quoted hunk ↗ jump to hunk
--- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h@@ -494,6 +494,11 @@ struct r5conf { struct r5worker_group *worker_groups; int group_cnt; int worker_cnt_per_group; + + /*For non-fullstripe-write, it need read some data
Missing space in the comment ;) /mjt