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

Bug #1745260 reported by Joshua R. Poulson on 2018-01-25
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux-azure (Ubuntu)
Undecided
Unassigned
Xenial
Undecided
Unassigned
linux-azure-edge (Ubuntu)
Undecided
Unassigned
Xenial
Undecided
Unassigned

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

Joshua R. Poulson (jrp) wrote :
affects: linux (Ubuntu) → linux-azure (Ubuntu)
Changed in linux-azure (Ubuntu):
status: New → Confirmed
tags: added: patch
tags: added: kernel-da-key kernel-hyper-v
Marcelo Cerri (mhcerri) wrote :

Josh. Should that patch also be applied to the 4.14 azure-edge kernel?

Joshua R. Poulson (jrp) wrote :

We should apply it to the azure 4.13 kernel (and beyond), but I think we will jump azure-edge to 4.15 as soon as it GAs and seems stable in hopes of switching linux-azure to 4.15 as the next bump. This way linux-azure for 16.04 and 18.04 will be the same.

Marcelo Cerri (mhcerri) on 2018-01-26
Changed in linux-azure-edge (Ubuntu):
status: New → Confirmed
Changed in linux-azure (Ubuntu):
status: Confirmed → In Progress
Marcelo Cerri (mhcerri) on 2018-01-26
Changed in linux-azure (Ubuntu Xenial):
status: New → Fix Committed
Marcelo Cerri (mhcerri) on 2018-01-29
Changed in linux-azure-edge (Ubuntu Xenial):
status: New → Fix Committed
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux-azure - 4.13.0-1009.12

---------------
linux-azure (4.13.0-1009.12) xenial; urgency=low

  * linux-azure: 4.13.0-1009.12 -proposed tracker (LP: #1746726)

  * libata: apply MAX_SEC_1024 to all LITEON EP1 series devices (LP: #1743053)
    - libata: apply MAX_SEC_1024 to all LITEON EP1 series devices

linux-azure (4.13.0-1008.11) xenial; urgency=low

  * linux-azure: 4.13.0-1008.11 -proposed tracker (LP: #1745669)

  * [Hyper-V] x86/hyperv: Stop suppressing X86_FEATURE_PCID (LP: #1745247)
    - x86/hyperv: Stop suppressing X86_FEATURE_PCID

  * [Hyper-V] scsi: storvsc: Spread interrupts when picking a channel for I/O
    requests (LP: #1745260)
    - SAUCE: scsi: storvsc: Spread interrupts when picking a channel for I/O
      requests

  * [Hyper-V] scsi: storvsc: Increase cmd_per_lun for higher speed devices
    (LP: #1745261)
    - SAUCE: scsi: storvsc: Increase cmd_per_lun for higher speed devices
    - [Config] CONFIG_SCSI_MQ_DEFAULT=y

 -- Marcelo Henrique Cerri <email address hidden> Thu, 01 Feb 2018 11:13:09 -0200

Changed in linux-azure (Ubuntu Xenial):
status: Fix Committed → Fix Released
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