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[Bug 1698371] Re: Azure: throughput performance regression after #1690177

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>
Date: Fri, 16 Jun 2017 18:34:22 -0000
Reply-to: Bug 1698371 <1698371@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

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

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https://bugs.launchpad.net/bugs/1698371

Title:
  Azure: throughput performance regression after #1690177

Status in linux-azure package in Ubuntu:
  In Progress
Status in linux-azure source package in Xenial:
  New

Bug description:
  SRU Justification:

  Impact: After #1690177, throughput between instances in Azure
  decreased drastically. The performance dropped from around 10
  Gbits/sec to 50 Mbits/sec.

  Fix: The problem seems to be caused by this commit:
  5740cde3743b vmbus: only reschedule tasklet if time limit exceeded

  Testcase: Use iperf between to Azure instances with the Azure kernel
  to measure throughput.

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