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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 0E3FEC433E1 for ; Tue, 18 Aug 2020 08:19:13 +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 BFD8A206B5 for ; Tue, 18 Aug 2020 08:19:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="KMFk/+1p" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BFD8A206B5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:46788 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k7wps-0003sS-0S for qemu-devel@archiver.kernel.org; Tue, 18 Aug 2020 04:19:12 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45074) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k7wpG-00036M-3D for qemu-devel@nongnu.org; Tue, 18 Aug 2020 04:18:34 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:42627 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1k7wpE-0001Rv-Gs for qemu-devel@nongnu.org; Tue, 18 Aug 2020 04:18:33 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1597738711; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=t4yqCo/ODp3jlouVXgXEEVLvwEsFeNxpRiGqBMxxA04=; b=KMFk/+1p8ZxqQi9n2PqffCFBC/ZkoktSrU9USxjZyBXCV/0NeYDZzh9GH15a+gV1pLArh7 uaIBfFQmcTx2/NC9dUTANK1av4mnlij4HBQ/I8wcOUDHR5TyFfQaEWb0FtfV+Y08YUAWja hE4Mwfx1VYCJcXKwvuhGmOgXAdzQOwQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-409-Un0XtcnnMZWszRqBTmMXww-1; Tue, 18 Aug 2020 04:18:29 -0400 X-MC-Unique: Un0XtcnnMZWszRqBTmMXww-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 23AD1425CE; Tue, 18 Aug 2020 08:18:28 +0000 (UTC) Received: from linux.fritz.box (ovpn-112-105.ams2.redhat.com [10.36.112.105]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E13C87DFC2; Tue, 18 Aug 2020 08:18:26 +0000 (UTC) Date: Tue, 18 Aug 2020 10:18:25 +0200 From: Kevin Wolf To: Alberto Garcia Subject: Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster Message-ID: <20200818081825.GA6865@linux.fritz.box> References: <20200817101019.GD11402@linux.fritz.box> <20200817155307.GS11402@linux.fritz.box> MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kwolf@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: none client-ip=207.211.31.120; envelope-from=kwolf@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/18 02:25:12 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: Vladimir Sementsov-Ogievskiy , qemu-devel@nongnu.org, qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Am 17.08.2020 um 20:18 hat Alberto Garcia geschrieben: > On Mon 17 Aug 2020 05:53:07 PM CEST, Kevin Wolf wrote: > > Maybe the difference is in allocating 64k at once instead of doing a > > separate allocation for every 4k block? But with the extent size hint > > patches to file-posix, we should allocate 1 MB at once by default now > > (if your test image was newly created). Can you check whether this is > > in effect for your image file? > > Ehmm... is that hint supported in ext4 or only in xfs? Hm, I had understood that ext4 supports this, but looking at the kernel code, it doesn't look like it. :-( Kevin