group.of.nepali.translators team mailing list archive

[Marcelo Cerri <1828248@xxxxxxxxxxxxxxxxxx>]

** Also affects: linux-azure (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux-azure (Ubuntu Xenial)
       Status: New => Fix Committed

-- 
You received this bug notification because you are a member of नेपाली
भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1828248

Title:
   [linux-azure] Storage performance drop on RAID

Status in linux-azure package in Ubuntu:
  New
Status in linux-azure source package in Xenial:
  Fix Committed

Bug description:
  In Azure, FIO 4k tests are showing performance drops on latest proposed 4.15.0 linux-azure kernels - from 52K IOPS to ~38K IOPS (max value reached on both sequential and random read tests).
  The setup used is 12 disks in RAID0.
  The affected kernels are:
  Ubuntu 14.04 + 4.15.0-1043
  Ubuntu 16.04 + 4.15.0-1044

  Previous kernel versions had reached max IOPS, ~52K IOPS on both read
  tests (e.g. 16.04 + 4.15.0-1043 kernel). Right now, it seems like the
  issue is in the diff from 1043 kernel on trusty vs 1044 kernel on
  xenial.

  The 52K IOPS is expected at qdepth=256. The repro cmd (as ran by the automation) is this:
  fio --size=1023G --direct=1 --ioengine=libaio --filename=/dev/md0 --overwrite=1 --readwrite=randread --bs=4K --runtime=300 --iodepth=32 --numjob=8 --output-format=json --output=/root/FIOLog/jsonLog/fio-result-randread-4K-256td.json --name='repro'

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1828248/+subscriptions