From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCHv4 18/43] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if
 huge page cache enabled
Date: Wed, 26 Oct 2016 00:36:19 -0700
Message-ID: <20161026073619.GB1128@infradead.org>
References: <20161025001342.76126-1-kirill.shutemov@linux.intel.com>
 <20161025001342.76126-19-kirill.shutemov@linux.intel.com>
 <20161025072122.GA21708@infradead.org>
 <20161025125431.GA22787@node.shutemov.name>
 <BD27B76A-AF34-48B9-8D4F-F69AD2C17C66@dilger.ca>
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Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
	Christoph Hellwig <hch@infradead.org>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Theodore Ts'o <tytso@mit.edu>,
	Andreas Dilger <adilger.kernel@dilger.ca>, Jan Kara <jack@suse.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Hugh Dickins <hughd@google.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Matthew Wilcox <willy@infradead.org>,
	Ross Zwisler <ross.zwisler@linux.intel.com>,
	linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-block@vger.kernel.org
To: Andreas Dilger <adilger@dilger.ca>
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On Tue, Oct 25, 2016 at 10:13:13PM -0600, Andreas Dilger wrote:
> Why wouldn't you have all the pool sizes in between?  Definitely 1MB has
> been too small already for high-bandwidth IO.  I wouldn't mind BIOs up to
> 4MB or larger since most high-end RAID hardware does best with 4MB IOs.

I/O sizes are not limited by the bio size, we can already support larger
than 1MB I/O for a long time.

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