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* Large latency with bcache for Ceph OSD(new mail thread)
@ 2021-03-02 10:20 Norman.Kern
  2021-03-02 13:20 ` Coly Li
  0 siblings, 1 reply; 6+ messages in thread
From: Norman.Kern @ 2021-03-02 10:20 UTC (permalink / raw)
  To: Coly Li; +Cc: linux-bcache, linux-block

Sorry for creating a new mail thread(the origin is so long...)


I made a test again and get more infomation:

root@WXS0089:~# cat /sys/block/bcache0/bcache/dirty_data
0.0k
root@WXS0089:~# lsblk /dev/sda
NAME      MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda         8:0    0 447.1G  0 disk
`-bcache0 252:0    0  10.9T  0 disk
root@WXS0089:~# cat /sys/block/sda/bcache/priority_stats
Unused:         1%
Clean:          29%
Dirty:          70%
Metadata:       0%
Average:        49
Sectors per Q:  29184768
Quantiles:      [1 2 3 5 6 8 9 11 13 14 16 19 21 23 26 29 32 36 39 43 48 53 59 65 73 83 94 109 129 156 203]
root@WXS0089:~# cat /sys/fs/bcache/066319e1-8680-4b5b-adb8-49596319154b/internal/gc_after_writeback
1
You have new mail in /var/mail/root
root@WXS0089:~# cat /sys/fs/bcache/066319e1-8680-4b5b-adb8-49596319154b/cache_available_percent
28

I read the source codes and found if cache_available_percent > 50, it should wakeup gc while doing writeback, but it seemed not work right.


^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2021-03-08  5:48 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-03-02 10:20 Large latency with bcache for Ceph OSD(new mail thread) Norman.Kern
2021-03-02 13:20 ` Coly Li
2021-03-03  3:25   ` Norman.Kern
2021-03-05  9:00   ` Norman.Kern
2021-03-05 10:03     ` Coly Li
2021-03-08  5:47       ` Norman.Kern

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