Public bug reported: ---Problem Description--- Default multipath policy is round-robin, shows considerably worse read throughput compared to using service-time Contact Information = Barbara Mundle, [email protected] ---uname output--- 4.4.0-21-generic Machine Type = z systems: Type 2964, Model 701 NC9 ---Debugger--- A debugger is not configured ---Steps to Reproduce--- Conducting throughput measurements with both policies shows the difference
Userspace tool common name: multipath-tools The userspace tool has the following bit modes: 64-bit Userspace rpm: multipath-tools_0.5.0+git1.656f8865-5ubuntu2.2_s390x.deb Userspace tool obtained from project website: na *Additional Instructions for Barbara Mundle, [email protected]: -Attach ltrace and strace of userspace application. Throughput numbers with FIO for sequential read (in KBPS) with multipath policies service.time/round-robin (varying with number of jobs from 1 - 64): service-time round-robin 1 3193030 2917220 2 5248430 5020375 4 8453570 6438140 8 9708690 6444175 16 9712100 6448080 32 9714035 6450905 64 9718355 6461650 ** Affects: multipath-tools (Ubuntu) Importance: Undecided Assignee: Skipper Bug Screeners (skipper-screen-team) Status: New ** Tags: architecture-s39064 bugnameltc-147635 severity-high targetmilestone-inin--- ** Tags added: architecture-s39064 bugnameltc-147635 severity-high targetmilestone-inin--- ** Changed in: ubuntu Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team) ** Package changed: ubuntu => multipath-tools (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1634161 Title: Default multipath policy is round-robin, shows considerably worse read throughput compared to using service-time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1634161/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
