From: Gabriel de Perthuis <g2p.code-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: Poor performance with bcache write-back mode
Date: Fri, 17 May 2013 20:50:08 +0000 (UTC) [thread overview]
Message-ID: <kn6560$o7q$1@ger.gmane.org> (raw)
In-Reply-To: 1368821584.52750.YahooMailNeo@web162405.mail.bf1.yahoo.com
On Fri, 17 May 2013 13:13:04 -0700, Patrick Ng wrote:
> Hi Robert,
>
> I have checked that the cache partition (/dev/sdc1) starts at 2048, it should be properly aligned.
> Similarly for the backing store partition (/dev/sdb1), it starts at 2048 at well.
The bcache superblock shifts the start of your partition by 8k though.
I don't know if the upper layers compensate for that, but just in case,
you may want to add `--data_offset 2048` to the make-bcache command line
(1M alignment).
next prev parent reply other threads:[~2013-05-17 20:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-16 21:51 Poor performance with bcache write-back mode Patrick Ng
[not found] ` <CA+gjuN7E2B+71BiCexm7HjDGzJMBuCdbGxhvD8YHU6-u6TyKkg@mail.gmail.com>
[not found] ` <CA+gjuN7E2B+71BiCexm7HjDGzJMBuCdbGxhvD8YHU6-u6TyKkg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-05-17 20:13 ` Patrick Ng
2013-05-17 20:50 ` Gabriel de Perthuis [this message]
[not found] ` <1368741106.62060.YahooMailNeo-QseONlJJzSFal3a5i+KC+JEhsgyP+Z75VpNB7YpNyf8@public.gmane.org>
2013-05-17 6:28 ` Robert Frånlund
2013-05-29 0:40 ` Kent Overstreet
2013-06-03 21:44 ` Patrick Ng
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