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Re: [Qemu-devel] [PATCH 1.8 4/6] block/iscsi: set bdi->cluster_size
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 1.8 4/6] block/iscsi: set bdi->cluster_size |
Date: |
Mon, 25 Nov 2013 16:02:12 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9 |
Il 25/11/2013 14:57, Peter Lieven ha scritto:
> this patch aims to set bdi->cluster_size to the internal page size
> of the iscsi target so that enabled callers can align requests
> properly.
>
> Signed-off-by: Peter Lieven <address@hidden>
> ---
> block/iscsi.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/block/iscsi.c b/block/iscsi.c
> index 93fee6d..75d6b87 100644
> --- a/block/iscsi.c
> +++ b/block/iscsi.c
> @@ -1580,6 +1580,13 @@ static int iscsi_get_info(BlockDriverState *bs,
> BlockDriverInfo *bdi)
> IscsiLun *iscsilun = bs->opaque;
> bdi->unallocated_blocks_are_zero = !!iscsilun->lbprz;
> bdi->can_write_zeroes_with_unmap = iscsilun->lbprz &&
> iscsilun->lbp.lbpws;
> + /* Guess the internal cluster (page) size of the iscsi target by the
> means
> + * of opt_unmap_gran. Transfer the unmap granularity only if it has a
> + * reasonable size for bdi->cluster_size */
> + if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 64 * 1024 &&
> + iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 *
> 1024) {
> + bdi->cluster_size = iscsilun->bl.opt_unmap_gran *
> iscsilun->block_size;
> + }
> return 0;
> }
>
>
After looking at patch 5, I think this one is correct.
Reviewed-by: Paolo Bonzini <address@hidden>
but I think you should make higher layers (qcow2) use the lower BDS's
granularity, at least as a default.
Paolo
- Re: [Qemu-devel] [PATCH 1.8 3/6] qemu-img: add option to specify alternate iobuffer size, (continued)
- Re: [Qemu-devel] [PATCH 1.8 3/6] qemu-img: add option to specify alternate iobuffer size, Peter Lieven, 2013/11/25
- Re: [Qemu-devel] [PATCH 1.8 3/6] qemu-img: add option to specify alternate iobuffer size, Paolo Bonzini, 2013/11/25
- Re: [Qemu-devel] [PATCH 1.8 3/6] qemu-img: add option to specify alternate iobuffer size, Peter Lieven, 2013/11/25
- Re: [Qemu-devel] [PATCH 1.8 3/6] qemu-img: add option to specify alternate iobuffer size, Paolo Bonzini, 2013/11/25
- Re: [Qemu-devel] [PATCH 1.8 3/6] qemu-img: add option to specify alternate iobuffer size, Peter Lieven, 2013/11/25
[Qemu-devel] [PATCH 1.8 2/6] qemu-img: fix usage instruction for qemu-img convert, Peter Lieven, 2013/11/25
[Qemu-devel] [PATCH 1.8 1/6] qemu-img: add support for skipping zeroes in input during convert, Peter Lieven, 2013/11/25
[Qemu-devel] [PATCH 1.8 4/6] block/iscsi: set bdi->cluster_size, Peter Lieven, 2013/11/25
[Qemu-devel] [PATCH 1.8 6/6] qemu-img: add option to show progress in sectors, Peter Lieven, 2013/11/25
[Qemu-devel] [PATCH 1.8 5/6] qemu-img: add option to align writes to cluster_sectors during convert, Peter Lieven, 2013/11/25
Re: [Qemu-devel] [PATCH 1.8 5/6] qemu-img: add option to align writes to cluster_sectors during convert, Peter Lieven, 2013/11/25
Re: [Qemu-devel] [PATCH 1.8 5/6] qemu-img: add option to align writes to cluster_sectors during convert, Paolo Bonzini, 2013/11/25