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From: | Peter Lieven |
Subject: | [Qemu-block] [RESEND] RFC chaning zlib windowBits for QCOW2 |
Date: | Mon, 27 Jul 2015 15:58:58 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
Hi, I was experimenting a little with optimized zlib versions (like zlib-ng) to optimize the speed of compressed qcow2 generation. I found out that chaning the windowBits from -12 to -15 alone increases compression speed by about 15% while lowering the compressed size by about 6%. As a test case I used a Debian 8.1 disk image. What is your opinion in chaning the windowBits? The cost is a higher memory usage. The usage changes from 272k -> 384k for compression and from 4k -> 32k for decompression. Peter
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