From patchwork Wed Jan 13 17:57:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Max Reitz X-Patchwork-Id: 1425953 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=FAIR5fiM; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4DGFlp5sYDz9sCD for ; Thu, 14 Jan 2021 05:07:34 +1100 (AEDT) Received: from localhost ([::1]:33874 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kzkYO-0000bb-Qf for incoming@patchwork.ozlabs.org; Wed, 13 Jan 2021 13:07:32 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:50144) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kzkPR-000206-Nh for qemu-devel@nongnu.org; Wed, 13 Jan 2021 12:58:18 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:37113) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kzkPP-00010w-Ga for qemu-devel@nongnu.org; Wed, 13 Jan 2021 12:58:17 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1610560694; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bU+AGmGeqHFzTcyXBp/no/OR5o6fbi0ENmf3b/ZaRlQ=; b=FAIR5fiMLInlLJNoezW8ksO+2P3/1LwNaU+zd/hKYhXJK89SaIGlZB+17fbvHV5ckuMx/G Hmvb+85ijomQsA//OqJy8UXfb3wNxv4y3LOKapxIeT24ERZpWe5YgFY8q/tOj5APAOG3Hz 9fC1FPtLSFUFXCRlzXNRCUdtkWt0Bq4= 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-65-TARGPk3bPqyXJ4EMnkkEOA-1; Wed, 13 Jan 2021 12:58:12 -0500 X-MC-Unique: TARGPk3bPqyXJ4EMnkkEOA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D656018C89C4; Wed, 13 Jan 2021 17:58:11 +0000 (UTC) Received: from localhost (ovpn-113-103.ams2.redhat.com [10.36.113.103]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 7216660C0F; Wed, 13 Jan 2021 17:58:11 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH v2 7/8] iotests/129: Limit mirror job's buffer size Date: Wed, 13 Jan 2021 18:57:51 +0100 Message-Id: <20210113175752.403022-8-mreitz@redhat.com> In-Reply-To: <20210113175752.403022-1-mreitz@redhat.com> References: <20210113175752.403022-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=mreitz@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.25, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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: Kevin Wolf , Vladimir Sementsov-Ogievskiy , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Issuing 'stop' on the VM drains all nodes. If the mirror job has many large requests in flight, this may lead to significant I/O that looks a bit like 'stop' would make the job try to complete (which is what 129 should verify not to happen). We can limit the I/O in flight by limiting the buffer size, so mirror will make very little progress during the 'stop' drain. (We do not need to do anything about commit, which has a buffer size of 512 kB by default; or backup, which goes cluster by cluster. Once we have asynchronous requests for backup, that will change, but then we can fine-tune the backup job to only perform a single request on a very small chunk, too.) Signed-off-by: Max Reitz Reviewed-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy --- tests/qemu-iotests/129 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tests/qemu-iotests/129 b/tests/qemu-iotests/129 index 7b4b6649f0..6d21470cd7 100755 --- a/tests/qemu-iotests/129 +++ b/tests/qemu-iotests/129 @@ -67,7 +67,7 @@ class TestStopWithBlockJob(iotests.QMPTestCase): def test_drive_mirror(self): self.do_test_stop("drive-mirror", device="drive0", target=self.target_img, format=iotests.imgfmt, - sync="full") + sync="full", buf_size=65536) def test_drive_backup(self): self.do_test_stop("drive-backup", device="drive0",