** Changed in: ubuntu-z-systems
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1634161
Title:
Default multipath policy is round-robin, shows considerably worse read
throughput compared to using service-time
Status in Ubuntu on IBM z Systems:
Fix Released
Status in multipath-tools package in Ubuntu:
Fix Released
Status in multipath-tools source package in Xenial:
New
Bug description:
---Problem Description---
Default multipath policy is round-robin, shows considerably worse read
throughput compared to using service-time
Contact Information = Barbara Mundle, barbara.mun...@de.ibm.com
---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, barbara.mun...@de.ibm.com:
-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
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