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[70.24.86.62]) by smtp.gmail.com with ESMTPSA id d4-20020ac851c4000000b003e4d9c91106sm4746365qtn.57.2023.05.30.08.46.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 May 2023 08:46:51 -0700 (PDT) Date: Tue, 30 May 2023 11:46:50 -0400 From: Peter Xu To: Andrei Gudkov Cc: qemu-devel@nongnu.org, quintela@redhat.com, eblake@redhat.com, armbru@redhat.com, berrange@redhat.com, zhengchuan@huawei.com Subject: Re: [PATCH v2 0/4] Migration time prediction using calc-dirty-rate Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: 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=-0.167, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Hi, Andrei, On Thu, Apr 27, 2023 at 03:42:56PM +0300, Andrei Gudkov via wrote: > Afterwards we tried to migrate VM after randomly selecting max downtime > and bandwidth limit. Typical prediction error is 6-7%, with only 180 out > of 5779 experiments failing badly: prediction error >=25% or incorrectly > predicting migration success when in fact it didn't converge. What's the normal size of the VMs when you did the measurements? A major challenge of convergence issues come from huge VMs and I'm wondering whether those are covered in the prediction verifications. Thanks, -- Peter Xu