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[Bug 1745260] Re: [Hyper-V] scsi: storvsc: Spread interrupts when picking a channel for I/O requests

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>
Date: Fri, 26 Jan 2018 19:44:18 -0000
Reply-to: Bug 1745260 <1745260@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

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

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

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https://bugs.launchpad.net/bugs/1745260

Title:
  [Hyper-V] scsi: storvsc: Spread interrupts when picking a channel for
  I/O requests

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

Bug description:
  Update the algorithm in storvsc_do_io to look for a channel
  starting with the current CPU + 1 and wrap around (within the
  current NUMA node). This spreads VMbus interrupts more evenly
  across CPUs. Previous code always started with first CPU in
  the current NUMA node, skewing the interrupt load to that CPU.

  This should be applied to the linux-azure kernel

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