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Re: [Qemu-devel] [PATCH 00/17] Support mismatched host and guest logical

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 00/17] Support mismatched host and guest logical block sizes
Date: Wed, 21 Dec 2011 18:00:03 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1

On 12/21/2011 05:55 PM, Christoph Hellwig wrote:
On Wed, Dec 14, 2011 at 01:40:22PM +0100, Paolo Bonzini wrote:
If the partitions are aligned, the OS will always issue aligned requests,
because file system blocks are already 4k.

It won't nessecarily.  For example XFS will do a fair amount of sub-blocksize
I/O for metadata and the log.  Note that if you tell XFS that the
minimal_io_size is 4k it will at least align the log write to it, which
is what really matters.

The physical_block_size doesn't matter?


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