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From: chandan <chandan@linux.vnet.ibm.com>
To: dsterba@suse.cz
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: Tue, 18 Mar 2014 13:48 +0630	[thread overview]
Message-ID: <1785327.CGV06aaKrn@localhost.localdomain> (raw)
In-Reply-To: <20140317145555.GG29256@twin.jikos.cz>

Hello David,

> I looked at previous postings of this patchset, but haven't found what
> are the expected supported block sizes.
> 
> I assume powers of two starting with 512b, until 64k.

The earlier patchset posted by Chandra Seethraman was to get 4k
blocksize to work with ppc64's 64k PAGE_SIZE. I chose to do 2k
blocksize on x86_64's 4k PAGE_SIZE since that would allow others in
the community to work/experiment with subpagesize-blocksize feature.

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.

Thanks,
chandan


  reply	other threads:[~2014-03-18  8:18 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 [this message]
2014-03-19 18:41     ` David Sterba
2014-03-20  3:20       ` Aneesh Kumar K.V
2014-04-03 17:01         ` David Sterba

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