From: Gabriel de Perthuis <g2p.code@gmail.com>
To: Zhi Yong Wu <zwu.kernel@gmail.com>, linux-btrfs@vger.kernel.org
Subject: Re: [RFC 0/5] BTRFS hot relocation support
Date: Thu, 09 May 2013 09:17:38 +0200 [thread overview]
Message-ID: <518B4D92.1030409@gmail.com> (raw)
In-Reply-To: <1367830418-26865-1-git-send-email-zwu.kernel@gmail.com>
On Thu, 09 May 2013 07:13:56 +0800, Zhi Yong Wu wrote:
> HI, all
>
> I saw that bcache will be merged into kernel upstream soon, so i
> want to know if btrfs hot relocation support is still meanful, if no,
> i will not continue to work on it. can anyone let me know this?
> thanks.
bcache performance would be poor if Btrfs-raid1 is used;
the hits will be spread across mirrors are random, bcache will have
to cache twice as much and convergence could be slow.
Hot tracking also has much more precise info about which files are hot,
whereas bcache can't know anything about files that are in the
page cache and risks evicting some of them.
It all comes down to benchmarks, but these two situations could be easy
wins for hot-reloc.
next prev parent reply other threads:[~2013-05-09 7:17 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-06 8:53 [RFC 0/5] BTRFS hot relocation support zwu.kernel
2013-05-06 8:53 ` [RFC 1/5] vfs: add one list_head field zwu.kernel
2013-05-06 8:53 ` [RFC 2/5] btrfs: add one new block group zwu.kernel
2013-05-06 8:53 ` [RFC 3/5] btrfs: add one hot relocation kthread zwu.kernel
2013-05-06 8:53 ` [RFC 4/5] procfs: add three proc interfaces zwu.kernel
2013-05-06 8:53 ` [RFC 5/5] btrfs: add hot relocation support zwu.kernel
2013-05-06 20:36 ` [RFC 0/5] BTRFS " Kai Krakow
2013-05-07 5:17 ` Tomasz Torcz
2013-05-07 21:17 ` Kai Krakow
2013-05-07 21:35 ` Gabriel de Perthuis
2013-05-07 21:58 ` Kai Krakow
2013-05-07 22:27 ` Gabriel de Perthuis
2013-05-08 23:13 ` Zhi Yong Wu
2013-05-09 6:30 ` Stefan Behrens
2013-05-09 6:42 ` Zhi Yong Wu
2013-05-09 7:41 ` Stefan Behrens
2013-05-09 7:49 ` Zhi Yong Wu
2013-05-09 7:28 ` Zheng Liu
2013-05-09 6:56 ` Roger Binns
2013-05-19 10:41 ` Martin Steigerwald
2013-05-19 13:43 ` Zhi Yong Wu
2013-05-19 14:42 ` Martin Steigerwald
2013-05-19 13:46 ` Zhi Yong Wu
2013-05-09 7:17 ` Gabriel de Perthuis [this message]
2013-05-14 15:24 ` Zhi Yong Wu
2013-05-16 7:12 ` Kai Krakow
2013-05-17 7:23 ` Zhi Yong Wu
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