Although the doc (Documentation/bcache.txt) seems to indicate that "bypassed" should contain cumulative IO for the stat period, I've noticed that it does not consistently increase. In fact, it increases and decreases quite a bit over a short period of time.
root@zapazoid:~# date Thu Jan 26 13:23:34 EST 2012 root@zapazoid:~# cat /sys/block/bcache0/bcache/stats_day/bypassed 5.4M root@zapazoid:~# cat /sys/block/bcache0/bcache/stats_day/bypassed 9.1M root@zapazoid:~# cat /sys/block/bcache0/bcache/stats_day/bypassed 1008k root@zapazoid:~# cat /sys/block/bcache0/bcache/stats_day/bypassed 2.4M root@zapazoid:~# cat /sys/block/bcache0/bcache/stats_day/bypassed 5.1M root@zapazoid:~# date Thu Jan 26 13:24:44 EST 2012 This is while doing an rsync into a cached filesystem, which I would imagine would entail a significant amount of sequential writes. Am I just misunderstanding what this is supposed to be telling me? -davidc -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
