From: Sitsofe Wheeler <sitsofe@yahoo.com>
To: Larkin Lowrey <llowrey@nuclearwinter.com>
Cc: linux-bcache@vger.kernel.org
Subject: Re: Slow writing of dirty data (bcache)
Date: Mon, 10 Mar 2014 20:56:20 +0000 [thread overview]
Message-ID: <20140310205612.GA19912@sucs.org> (raw)
In-Reply-To: <531DE9A5.90801@nuclearwinter.com>
On Mon, Mar 10, 2014 at 11:34:45AM -0500, Larkin Lowrey wrote:
>
> has 160+MB of dirty data. The dirty data is being written at a rate of 1
> page per second (8 sectors). At this rate it'll take 11 hrs to finish. I
> like to keep this array spun down when inactive but the drives can't
> spin down since they're being written to once a second.
>
> This never happened when running 3.12.7. Is there anything I can do
> about this?
I believe this is intended behaviour - as the cache approaches the
writeback_percent level of fullness the rate of writeback will increase.
It is possible to override the writeback_rate by echoing a new value
into it but it will also change itself so you may find the rate falls
again... Perhaps that can be avoided by echoing 0 into
writeback_percent too (see
http://evilpiepirate.org/git/linux-bcache.git/tree/Documentation/bcache.txt?h=bcache-dev#n265)...
--
Sitsofe | http://sucs.org/~sits/
next prev parent reply other threads:[~2014-03-10 20:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-10 16:34 Slow writing of dirty data (bcache) Larkin Lowrey
2014-03-10 20:56 ` Sitsofe Wheeler [this message]
[not found] ` <CALJ65zm4O8KeA1vjhupAFoqh+07qH5OaLMCbm-fShkZk6nf9MA@mail.gmail.com>
2014-03-10 21:14 ` Larkin Lowrey
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