From: Kent Overstreet <kent.overstreet@gmail.com>
To: Marcin <marcin@mejor.pl>
Cc: linux-bcache@vger.kernel.org
Subject: Re: [branch:bcachefs-testing][tier] Massive slow down after some time
Date: Sun, 6 Nov 2016 05:32:19 -0900 [thread overview]
Message-ID: <20161106143219.jvstkt7ucjyxhr5p@kmo-pixel> (raw)
In-Reply-To: <d61c1210e331ff556a9fd1d14c278a01@mejor.pl>
On Sun, Nov 06, 2016 at 03:04:12PM +0100, Marcin wrote:
> Hi!
> I'm trying mentioned branch. I've got tiered bcachefs witch lz4 compresion
> turned on.
> After some times of copying of files into bcachefs I noticed huge slow downa
> of writing. Htop shows that kernel thread bcache_gc consumes a lot of CPU
> and spends a lot of time waiting for I/O. Iostat shows that almost all
> I/Ooperations goes to tier 1. In dmesg I see a couple of repeated messages
> (they appears together, "INFO: task kworker/u8:2:11787 blocked for more than
> 120 seconds." with "INFO: task rsync:11935 blocked for more than 120
> seconds." :
Sounds like tiering isn't freeing up space on tier 0... Can you check
cache0/alloc_debug (assuming cache0 is your tier 0 device) to confirm?
After that, could you hammer on single device mode for awhile? I need to know if
I'm just looking for tiering bugs, or if the btree changes have issues.
prev parent reply other threads:[~2016-11-06 14:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-06 14:04 [branch:bcachefs-testing][tier] Massive slow down after some time Marcin
2016-11-06 14:32 ` Kent Overstreet [this message]
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