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qemu-img convert: Don't pre-zero images 

Since commit 5a37b60a61, qemu-img create will pre-zero the target image
if it isn't already zero-initialised (most importantly, for host block
devices, but also iscsi etc.), so that writing explicit zeros wouldn't
be necessary later.

This could speed up the operation significantly, in particular when the
source image file was only sparsely populated. However, it also means
that some block are written twice: Once when pre-zeroing them, and then
when they are overwritten with actual data. On a full image, the
pre-zeroing is wasted work because everything will be overwritten.

In practice, write_zeroes typically turns out faster than writing
explicit zero buffers, but slow enough that first zeroing everything and
then overwriting parts can be a significant net loss.

Meanwhile, qemu-img convert was rewritten in 690c730160 and zero blocks
are now written to the target using bdrv_co_pwrite_zeroes() if the
target could be pre-zeroed. This way we already make use of the faster
write_zeroes operation, but avoid writing any blocks twice.

Remove the pre-zeroing because these days this former optimisation has
actually turned into a pessimisation in the common case.

Reported-by: Nir Soffer <nsoffer@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200622151203.35624-1-kwolf@redhat.com>
Tested-by:  Nir Soffer <nsoffer@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2020-06-22 17:12:03 +02:00
parent 64f0ad8ad8
commit edafc70c0c
1 changed files with 0 additions and 9 deletions
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9
qemu-img.c
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@ -2084,15 +2084,6 @@ static int convert_do_copy(ImgConvertState *s)
s->has_zero_init = bdrv_has_zero_init(blk_bs(s->target));
}
if (!s->has_zero_init && !s->target_has_backing &&
bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)))
{
ret = blk_make_zero(s->target, BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK);
if (ret == 0) {
s->has_zero_init = true;
}
}
/* Allocate buffer for copied data. For compressed images, only one cluster
* can be copied at a time. */
if (s->compressed) {