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[Qemu-devel] [PATCH 0/4] block/qcow2: add compression_algorithm create o
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCH 0/4] block/qcow2: add compression_algorithm create option |
Date: |
Tue, 27 Jun 2017 14:34:06 +0200 |
this adds a create option for QCOW2 images to specify the compression algorithm
for compressed clusters. The series adds 3 algorithms to choose from:
zlib (default), zlib-fast and lzo. zlib-fast optimizes the zlib parameters
without the need for an additional compression library. lzo is choosen
as we already link against it and its widely available. Further
libraries like zstd are in preparation.
Compression time vs. size of an uncompressed Debian 9 QCOW2 image (size 1148MB):
zlib 35.7s 339MB
zlib-fast 12.8s 348MB
lzo 4.2s 429MB
Peter Lieven (4):
block/qcow2: add compression_algorithm create option
block/qcow2: optimize qcow2_co_pwritev_compressed
block/qcow2: add lzo compression algorithm
block/qcow2: add zlib-fast compression algorithm
block/qcow2-cluster.c | 66 ++++++++++------
block/qcow2.c | 186 +++++++++++++++++++++++++++++++++++++---------
block/qcow2.h | 22 ++++--
configure | 2 +-
docs/interop/qcow2.txt | 8 +-
include/block/block_int.h | 35 ++++-----
qemu-img.texi | 12 +++
7 files changed, 251 insertions(+), 80 deletions(-)
--
1.9.1
- [Qemu-devel] [PATCH 0/4] block/qcow2: add compression_algorithm create option,
Peter Lieven <=
Re: [Qemu-devel] [PATCH 1/4] block/qcow2: add compression_algorithm create option, Daniel P. Berrange, 2017/06/27