kernel-packages team mailing list archive

[Paolo Pisati <1396470@xxxxxxxxxxxxxxxxxx>]

** Description changed:

+ [Impact]
+ Degraded performance during network and disk activity in a kvm guest.
+ 
+ [Test case]
+ Try booting a vm and do some disk/net activity with and without this driver.
+ 
+ [Regression potential]
+ In case of regressions, it will just hit people using kvm on 32bit armhf hardware (the lpae variant in particular): we already had this driver on in the past, it's on by default on every arch, it's widely used and upstream is very active - i say it's a low potential regression.
+ 
+ --
  Hi,
  
  The current armmp (linux-image-3.16.0-26-generic_3.16.0-26.34_armhf.deb)
  could have virtio-mmio enabled for faster vm guests. Currenlty it seems
  to have:
  
  CONFIG_NET_9P_VIRTIO=m
  CONFIG_VIRTIO_BLK=y
  CONFIG_SCSI_VIRTIO=m
  CONFIG_VIRTIO_NET=y
  CONFIG_CAIF_VIRTIO=m
  CONFIG_VIRTIO_CONSOLE=y
  CONFIG_HW_RANDOM_VIRTIO=m
  CONFIG_VIRTIO=y
  CONFIG_VIRTIO_PCI=y
  # CONFIG_VIRTIO_BALLOON is not set
  # CONFIG_VIRTIO_MMIO is not set
  
  Now using virtio net and block is not possible, and you have to revert
  to emulated devices.

-- 
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https://bugs.launchpad.net/bugs/1396470

Title:
  please enable CONFIG_VIRTIO_MMIO on armmp

Status in linux package in Ubuntu:
  Triaged

Bug description:
  [Impact]
  Degraded performance during network and disk activity in a kvm guest.

  [Test case]
  Try booting a vm and do some disk/net activity with and without this driver.

  [Regression potential]
  In case of regressions, it will just hit people using kvm on 32bit armhf hardware (the lpae variant in particular): we already had this driver on in the past, it's on by default on every arch, it's widely used and upstream is very active - i say it's a low potential regression.

  --
  Hi,

  The current armmp (linux-
  image-3.16.0-26-generic_3.16.0-26.34_armhf.deb) could have virtio-mmio
  enabled for faster vm guests. Currenlty it seems to have:

  CONFIG_NET_9P_VIRTIO=m
  CONFIG_VIRTIO_BLK=y
  CONFIG_SCSI_VIRTIO=m
  CONFIG_VIRTIO_NET=y
  CONFIG_CAIF_VIRTIO=m
  CONFIG_VIRTIO_CONSOLE=y
  CONFIG_HW_RANDOM_VIRTIO=m
  CONFIG_VIRTIO=y
  CONFIG_VIRTIO_PCI=y
  # CONFIG_VIRTIO_BALLOON is not set
  # CONFIG_VIRTIO_MMIO is not set

  Now using virtio net and block is not possible, and you have to revert
  to emulated devices.

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