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Re: [Qemu-devel] [PATCH 00/17] Support mismatched host and guest logical
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From: |
Christoph Hellwig |
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Subject: |
Re: [Qemu-devel] [PATCH 00/17] Support mismatched host and guest logical block sizes |
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Date: |
Wed, 21 Dec 2011 17:55:28 +0100 |
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User-agent: |
Mutt/1.5.17 (2007-11-01) |
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.
- [Qemu-devel] [PATCH 10/17] raw: probe host_block_size, (continued)
- [Qemu-devel] [PATCH 10/17] raw: probe host_block_size, Paolo Bonzini, 2011/12/13
- [Qemu-devel] [PATCH 16/17] block: default physical block size to host block size, Paolo Bonzini, 2011/12/13
- [Qemu-devel] [PATCH 14/17] block: protect against "torn reads" for guest_block_size > host_block_size, Paolo Bonzini, 2011/12/13
- [Qemu-devel] [PATCH 15/17] block: align and serialize I/O when guest_block_size < host_block_size, Paolo Bonzini, 2011/12/13
- [Qemu-devel] [PATCH 13/17] block: allow waiting at arbitrary granularity, Paolo Bonzini, 2011/12/13
- [Qemu-devel] [PATCH 17/17] qemu-io: add blocksize argument to open, Paolo Bonzini, 2011/12/13
- Re: [Qemu-devel] [PATCH 00/17] Support mismatched host and guest logical block sizes, Kevin Wolf, 2011/12/14