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:
> --- 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
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