diff options
| -rw-r--r-- | drivers/md/md.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index f3fed662f32..78c7418478d 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -3846,11 +3846,20 @@ static int is_mddev_idle(mddev_t *mddev) curr_events = disk_stat_read(disk, sectors[0]) + disk_stat_read(disk, sectors[1]) - atomic_read(&disk->sync_io); - /* Allow some slack between valud of curr_events and last_events, - * as there are some uninteresting races. + /* The difference between curr_events and last_events + * will be affected by any new non-sync IO (making + * curr_events bigger) and any difference in the amount of + * in-flight syncio (making current_events bigger or smaller) + * The amount in-flight is currently limited to + * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6 + * which is at most 4096 sectors. + * These numbers are fairly fragile and should be made + * more robust, probably by enforcing the + * 'window size' that md_do_sync sort-of uses. + * * Note: the following is an unsigned comparison. */ - if ((curr_events - rdev->last_events + 32) > 64) { + if ((curr_events - rdev->last_events + 4096) > 8192) { rdev->last_events = curr_events; idle = 0; } @@ -4109,7 +4118,7 @@ static void md_do_sync(mddev_t *mddev) if (currspeed > sysctl_speed_limit_min) { if ((currspeed > sysctl_speed_limit_max) || !is_mddev_idle(mddev)) { - msleep(250); + msleep(500); goto repeat; } } |