From: David Sterba <dsterba@suse.cz>
To: chandan <chandan@linux.vnet.ibm.com>
Cc: linux-btrfs@vger.kernel.org, aneesh.kumar@linux.vnet.ibm.com
Subject: Re: [PATCH 0/6 EARLY RFC] Btrfs: Get rid of whole page I/O.
Date: Wed, 19 Mar 2014 19:41:07 +0100 [thread overview]
Message-ID: <20140319184107.GJ29256@suse.cz> (raw)
In-Reply-To: <1785327.CGV06aaKrn@localhost.localdomain>
On Tue, Mar 18, 2014 at 01:48:00PM +0630, chandan wrote:
> The earlier patchset posted by Chandra Seethraman was to get 4k
> blocksize to work with ppc64's 64k PAGE_SIZE.
Are we talking about metadata block sizes or data block sizes?
> The root node of "tree root" tree has 1957 bytes being written by
> make_btrfs() (in btrfs-progs). Hence I chose to do 2k blocksize for
> the initial subpagesize-blocksize work. So with this patchset the
> supported blocksizes would be in the range 2k-64k.
So it's metadata blocks, and in this case 2k looks like the only
allowed size that's smaller than 4k, and thus can demonstrage sub-page
size allocations. I'm not sure if this is limiting for potential future
extensions of metadata structures that could be larger.
2k is ok for testing purposes, but I think a 4k-page machine will hardly
use a smaller page size. The more that 16k metadata blocks are now
default.
next prev parent reply other threads:[~2014-03-19 18:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-12 14:20 [PATCH 0/6 EARLY RFC] Btrfs: Get rid of whole page I/O Chandan Rajendra
2014-03-12 14:20 ` [PATCH 1/6] Btrfs: subpagesize-blocksize: Get rid of whole page reads Chandan Rajendra
2014-03-19 7:37 ` Liu Bo
2014-03-19 15:50 ` chandan Rajendra
2014-03-12 14:20 ` [PATCH 2/6] Btrfs: subpagesize-blocksize: Get rid of whole page writes Chandan Rajendra
2014-03-12 14:20 ` [PATCH 3/6] Btrfs: subpagesize-blocksize: Work with extents aligned to blocksize Chandan Rajendra
2014-03-12 14:20 ` [PATCH 4/6] Btrfs: subpagesize-blocksize: Define extent_buffer_head Chandan Rajendra
2014-03-12 14:20 ` [PATCH 5/6] Btrfs: subpagesize-blocksize: Hardcode MAX_EXTENT_BUFFERS_PER_PAGE to 2 Chandan Rajendra
2014-03-12 14:20 ` [PATCH 6/6] Btrfs: subpagesize-blocksize: Allow mounting filesystems where sectorsize != PAGE_SIZE Chandan Rajendra
2014-03-17 14:55 ` [PATCH 0/6 EARLY RFC] Btrfs: Get rid of whole page I/O David Sterba
2014-03-18 7:18 ` chandan
2014-03-19 18:41 ` David Sterba [this message]
2014-03-20 3:20 ` Aneesh Kumar K.V
2014-04-03 17:01 ` David Sterba
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