>From the timestamps, that's decaying way too fast. Looks like a bug. On Thu, Jan 26, 2012 at 10:38 AM, Adam Berkan <aberkan@xxxxxxxxxx> wrote: > The /sys/block/bcache0/bcache/stats_total/bypassed should accumulate > (notice the stats_total), but stats_day only shows results with an > exponentially weighted average with a half life of 1 day. If your > load varies during the day, the amount bypassed will swing up and down > accordingly. > > Adam > > On Thu, Jan 26, 2012 at 10:31 AM, David Rhodes Clymer > <david@xxxxxxxxxxxxxx> wrote: >> >> 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 majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > -- > To unsubscribe from this list: send the line "unsubscribe linux-bcache" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
