From: "Norman.Kern" <norman.kern@gmx.com>
To: Coly Li <colyli@suse.de>
Cc: linux-bcache@vger.kernel.org, linux-block@vger.kernel.org
Subject: Large latency with bcache for Ceph OSD(new mail thread)
Date: Tue, 2 Mar 2021 18:20:25 +0800 [thread overview]
Message-ID: <9b7dfd49-67b0-53b1-96e1-3b90c2d9d09a@gmx.com> (raw)
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.
next reply other threads:[~2021-03-02 23:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 10:20 Norman.Kern [this message]
2021-03-02 13:20 ` Large latency with bcache for Ceph OSD(new mail thread) 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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