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[Qemu-devel] [PATCH 0/7] qcow2 decompress in threads
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-devel] [PATCH 0/7] qcow2 decompress in threads |
Date: |
Thu, 1 Nov 2018 21:27:31 +0300 |
Hi all!
The series brings threads to qcow2 decompression path, like it is
already done for compression.
Performance gain is illustrated by the following test:
[]# cat gen.sh
#!/bin/bash
echo 'create pattern-file /ssd/t_pat'
./qemu-img create -f raw /ssd/t_pat 10g
for i in {0..9}; do
./qemu-io -f raw -c "write -P 0xab ${i}g 1g" /ssd/t_pat
done
echo 'convert it to compressed /ssd/t_pat.compressed.qcow2'
./qemu-img convert -W -f raw -O qcow2 -c /ssd/t_pat /ssd/t_pat.compressed.qcow2
rm -f /ssd/t_pat
test:
[]# time ./qemu-img convert -f qcow2 --target-image-opts -n
/ssd/t_pat.compressed.qcow2 'driver=null-co,size=10G'
result before the series:
real 0m16.585s
user 0m14.899s
sys 0m2.219s
result after the series:
real 0m6.528s
user 0m19.343s
sys 0m3.081s
Note: my cpu is 4-cores 8-threads i7-4790
Vladimir Sementsov-Ogievskiy (7):
qcow2: use Z_OK instead of 0 for deflateInit2 return code check
qcow2: make more generic interface for qcow2_compress
qcow2: move decompression from qcow2-cluster.c to qcow2.c
qcow2: refactor decompress_buffer
qcow2: use byte-based read in qcow2_decompress_cluster
qcow2: aio support for compressed cluster read
qcow2: do decompression in threads
block/qcow2.h | 4 -
block/qcow2-cluster.c | 70 -----------------
block/qcow2.c | 169 +++++++++++++++++++++++++++++++++++-------
3 files changed, 143 insertions(+), 100 deletions(-)
--
2.18.0
- [Qemu-devel] [PATCH 0/7] qcow2 decompress in threads,
Vladimir Sementsov-Ogievskiy <=
- [Qemu-devel] [PATCH 5/7] qcow2: use byte-based read in qcow2_decompress_cluster, Vladimir Sementsov-Ogievskiy, 2018/11/01
- [Qemu-devel] [PATCH 4/7] qcow2: refactor decompress_buffer, Vladimir Sementsov-Ogievskiy, 2018/11/01
- [Qemu-devel] [PATCH 2/7] qcow2: make more generic interface for qcow2_compress, Vladimir Sementsov-Ogievskiy, 2018/11/01
- [Qemu-devel] [PATCH 3/7] qcow2: move decompression from qcow2-cluster.c to qcow2.c, Vladimir Sementsov-Ogievskiy, 2018/11/01
- [Qemu-devel] [PATCH 1/7] qcow2: use Z_OK instead of 0 for deflateInit2 return code check, Vladimir Sementsov-Ogievskiy, 2018/11/01