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[99.254.144.39]) by smtp.gmail.com with ESMTPSA id l20-20020ad44454000000b006261e6a88c7sm170462qvt.36.2023.06.01.18.16.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Jun 2023 18:16:35 -0700 (PDT) From: Peter Xu To: qemu-devel@nongnu.org Cc: Avihai Horon , Paolo Bonzini , =?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= , Leonardo Bras Soares Passos , Juan Quintela , peterx@redhat.com, Laurent Vivier , Thomas Huth Subject: [PATCH RFC 3/3] qtest/migration: Use switchover-hold to speedup Date: Thu, 1 Jun 2023 21:16:26 -0400 Message-Id: <20230602011626.226640-4-peterx@redhat.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230602011626.226640-1-peterx@redhat.com> References: <20230602011626.226640-1-peterx@redhat.com> MIME-Version: 1.0 Received-SPF: pass client-ip=170.10.133.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.166, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Use the switchover-hold flag rather than tuning bw+downtime to guide test convergence. This can achieve similar goal of previous patch "tests/qtest: massively speed up migration-test" but without magic offset to write or monitoring. The initial solution can reduce migration-test time from 8min to 1min40s, this patch can further reduce it from 1m40s to 1m1s per my local test. Signed-off-by: Peter Xu --- tests/qtest/migration-test.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c index b0c355bbd9..62bdd67fd9 100644 --- a/tests/qtest/migration-test.c +++ b/tests/qtest/migration-test.c @@ -433,16 +433,15 @@ static void migrate_set_parameter_bool(QTestState *who, const char *parameter, static void migrate_ensure_non_converge(QTestState *who) { - /* Can't converge with 1ms downtime + 3 mbs bandwidth limit */ - migrate_set_parameter_int(who, "max-bandwidth", 3 * 1000 * 1000); - migrate_set_parameter_int(who, "downtime-limit", 1); + /* Hold off switchover for precopy only */ + migrate_set_parameter_bool(who, "switchover-hold", true); } static void migrate_ensure_converge(QTestState *who) { - /* Should converge with 30s downtime + 1 gbs bandwidth limit */ - migrate_set_parameter_int(who, "max-bandwidth", 1 * 1000 * 1000 * 1000); - migrate_set_parameter_int(who, "downtime-limit", 30 * 1000); + /* No limitation on bandwidth so converge faster */ + migrate_set_parameter_int(who, "max-bandwidth", 0); + migrate_set_parameter_bool(who, "switchover-hold", false); } static void migrate_pause(QTestState *who) @@ -492,6 +491,13 @@ static void migrate_postcopy_start(QTestState *from, QTestState *to) } qtest_qmp_eventwait(to, "RESUME"); + + /* + * Now allow precopy switchover (which will allow completion). This + * needs to be done after migrate-start-postcopy to make sure we switch + * to postcopy first. + */ + migrate_ensure_converge(from); } typedef struct { @@ -1164,6 +1170,8 @@ static int migrate_postcopy_prepare(QTestState **from_ptr, } migrate_ensure_non_converge(from); + /* Still use unlimited precopy speed to finish 1st iteration fast */ + migrate_set_parameter_int(from, "max-bandwidth", 0); /* Wait for the first serial output from the source */ wait_for_serial("src_serial");