From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18A6FC0650E for ; Wed, 3 Jul 2019 11:04:20 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EDFF6218A5 for ; Wed, 3 Jul 2019 11:04:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EDFF6218A5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=virtuozzo.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:34880 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hid3i-0003o3-23 for qemu-devel@archiver.kernel.org; Wed, 03 Jul 2019 07:04:18 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59728) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hid0q-0000Sz-Ln for qemu-devel@nongnu.org; Wed, 03 Jul 2019 07:01:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hid0o-0004T4-Ki for qemu-devel@nongnu.org; Wed, 03 Jul 2019 07:01:20 -0400 Received: from relay.sw.ru ([185.231.240.75]:59416) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hid0V-0003oM-4G; Wed, 03 Jul 2019 07:00:59 -0400 Received: from [10.94.4.71] (helo=dptest2.qa.sw.ru) by relay.sw.ru with esmtp (Exim 4.92) (envelope-from ) id 1hid0O-0004EW-Nw; Wed, 03 Jul 2019 14:00:53 +0300 From: Denis Plotnikov To: kwolf@redhat.com, mreitz@redhat.com, eblake@redhat.com, armbru@redhat.com Date: Wed, 3 Jul 2019 14:00:41 +0300 Message-Id: <20190703110044.25610-1-dplotnikov@virtuozzo.com> X-Mailer: git-send-email 2.17.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH v1 0/3] add zstd cluster compression X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: vsementsov@virtuozzo.com, den@virtuozzo.com, qemu-block@nongnu.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" change log: v1: * extend qcow2 header instead of adding a new incompatible extension header specification re-written accordingly * enable zstd compression via config * fix zstd (de)compression functions * fix comments/description * fix function naming --- The goal of the patch-set is to enable qcow2 to use zstd compression for clusters. ZSTD provides better (de)compression performance than currently used ZLIB. Using it will improve perforamnce (reduce compression time) when the compressed clusters is used, e.g backup scenarios. Also, the patch-set extends qcow2 specification by adding compression_type feature. The feature enables adding ZSTD and another compression algorithms in the future. Here is some measurements ZSTD vs ZLIB: The test: Test compresses and decompresses qemu qcow2 image with just installed rhel-7.6 guest. Image cluster size: 64K. Image on disk size: 2.2G The test was conducted with brd disk to reduce the influence of disk subsystem to the test results. The results is given in seconds. compress cmd: time ./qemu-img convert -O qcow2 -c -o compression_type=[zlib|zstd] src.img [zlib|zstd]_compressed.img decompress cmd time ./qemu-img convert -O qcow2 [zlib|zstd]_compressed.img uncompressed.img The results: compression decompression zlib zstd zlib zstd ------------------------------------------------------------ real 65.5 16.3 (-75 %) 1.9 1.6 (-16 %) user 65.0 15.8 5.3 2.5 sys 3.3 0.2 2.0 2.0 Both ZLIB and ZSTD gave the same compression ratio: ~1.5 compressed image size in both cases: ~1.4G Denis Plotnikov (3): qcow2: introduce compression type feature qcow2: rework the cluster compression routine qcow2: add zstd cluster compression block/qcow2.c | 283 +++++++++++++++++++++++++++++++++++--- block/qcow2.h | 26 +++- configure | 32 +++++ docs/interop/qcow2.txt | 22 ++- include/block/block_int.h | 1 + qapi/block-core.json | 23 +++- 6 files changed, 357 insertions(+), 30 deletions(-) -- 2.17.0