[Qemu-devel] [Bug 1802915] [NEW] GTK display refresh rate is throttled

[Qemu-devel] [Bug 1802915] [NEW] GTK display refresh rate is throttled

[Chen Zhang]

Public bug reported:

Guest OS running with GL enabled GTK display shows a reduced refresh
rate, e.g. moving cursor around with iGVT-g DMA Buf.

It seems that a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
(30ms) is defined in include/ui/console.h, throttling the display
refresh rate at 33Hz.

To correct this throttle issue, a shorter interval should be applied to
display change listener or the default value should be used.

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: gtk ui

** Attachment added: "slow motion of a throttled windows guest"
   https://bugs.launchpad.net/bugs/1802915/+attachment/5211842/+files/guest.mov

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Title:
  GTK display refresh rate is throttled

Status in QEMU:
  New

Bug description:
  Guest OS running with GL enabled GTK display shows a reduced refresh
  rate, e.g. moving cursor around with iGVT-g DMA Buf.

  It seems that a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
  (30ms) is defined in include/ui/console.h, throttling the display
  refresh rate at 33Hz.

  To correct this throttle issue, a shorter interval should be applied
  to display change listener or the default value should be used.

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[Qemu-devel] [Bug 1802915] Re: GTK display refresh rate is throttled

[Chen Zhang]

Slow motion clips for host/guest were uploaded as attachments.

** Attachment added: "slow motion for host os"
   https://bugs.launchpad.net/qemu/+bug/1802915/+attachment/5211843/+files/host.mov

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Title:
  GTK display refresh rate is throttled

Status in QEMU:
  New

Bug description:
  Guest OS running with GL enabled GTK display shows a reduced refresh
  rate, e.g. moving cursor around with iGVT-g DMA Buf.

  It seems that a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
  (30ms) is defined in include/ui/console.h, throttling the display
  refresh rate at 33Hz.

  To correct this throttle issue, a shorter interval should be applied
  to display change listener or the default value should be used.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1802915/+subscriptions

[Qemu-devel] [Bug 1802915] Re: GTK display refresh rate is throttled

[Chen Zhang]

** Description changed:

  Guest OS running with GL enabled GTK display shows a reduced refresh
  rate, e.g. moving cursor around with iGVT-g DMA Buf.
  
- It seems that a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
+ Apparently, a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
  (30ms) is defined in include/ui/console.h, throttling the display
  refresh rate at 33Hz.
  
- To correct this throttle issue, a shorter interval should be applied to
- display change listener or the default value should be used.
+ To correct this throttle issue, a shorter interval (16 or 17
+ milliseconds) should be applied to display change listener or the
+ default value should be modified.

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Title:
  GTK display refresh rate is throttled

Status in QEMU:
  New

Bug description:
  Guest OS running with GL enabled GTK display shows a reduced refresh
  rate, e.g. moving cursor around with iGVT-g DMA Buf.

  Apparently, a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
  (30ms) is defined in include/ui/console.h, throttling the display
  refresh rate at 33Hz.

  To correct this throttle issue, a shorter interval (16 or 17
  milliseconds) should be applied to display change listener or the
  default value should be modified.

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https://bugs.launchpad.net/qemu/+bug/1802915/+subscriptions

[Qemu-devel] [Bug 1802915] Re: GTK display refresh rate is throttled

[Thomas Arouge]

Instead of changing the value, I think there should be a function that
determines the ideal "GUI_REFRESH_INTERVAL_DEFAULT" value, with the
option to override it. That way, monitor greater than 60 Hz can also
benefit.

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Title:
  GTK display refresh rate is throttled

Status in QEMU:
  New

Bug description:
  Guest OS running with GL enabled GTK display shows a reduced refresh
  rate, e.g. moving cursor around with iGVT-g DMA Buf.

  Apparently, a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
  (30ms) is defined in include/ui/console.h, throttling the display
  refresh rate at 33Hz.

  To correct this throttle issue, a shorter interval (16 or 17
  milliseconds) should be applied to display change listener or the
  default value should be modified.

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[Bug 1802915] Re: GTK display refresh rate is throttled

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to
another system. For this we need to know which bugs are still valid
and which could be closed already. Thus we are setting older bugs to
"Incomplete" now.

If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.

Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: New => Incomplete

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Title:
  GTK display refresh rate is throttled

Status in QEMU:
  Incomplete

Bug description:
  Guest OS running with GL enabled GTK display shows a reduced refresh
  rate, e.g. moving cursor around with iGVT-g DMA Buf.

  Apparently, a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
  (30ms) is defined in include/ui/console.h, throttling the display
  refresh rate at 33Hz.

  To correct this throttle issue, a shorter interval (16 or 17
  milliseconds) should be applied to display change listener or the
  default value should be modified.

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[Bug 1802915] Re: GTK display refresh rate is throttled

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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Title:
  GTK display refresh rate is throttled

Status in QEMU:
  Expired

Bug description:
  Guest OS running with GL enabled GTK display shows a reduced refresh
  rate, e.g. moving cursor around with iGVT-g DMA Buf.

  Apparently, a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
  (30ms) is defined in include/ui/console.h, throttling the display
  refresh rate at 33Hz.

  To correct this throttle issue, a shorter interval (16 or 17
  milliseconds) should be applied to display change listener or the
  default value should be modified.

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[Bug 1802915] Re: GTK display refresh rate is throttled

[Jose Biosca]

The bug is still here.

People are simply modifying the code and recompiling.. It only needs to
change the code cap from 30ms (10 years old cap) to 16ms, and we got a
smooth gui capable of gaming.

Please, don't ignore us. Recompiling qemu only for one number is very
annoying.

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Title:
  GTK display refresh rate is throttled

Status in QEMU:
  Expired

Bug description:
  Guest OS running with GL enabled GTK display shows a reduced refresh
  rate, e.g. moving cursor around with iGVT-g DMA Buf.

  Apparently, a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
  (30ms) is defined in include/ui/console.h, throttling the display
  refresh rate at 33Hz.

  To correct this throttle issue, a shorter interval (16 or 17
  milliseconds) should be applied to display change listener or the
  default value should be modified.

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[Bug 1802915] Re: GTK display refresh rate is throttled

[Lee Garrett]

** Changed in: qemu
       Status: Expired => Confirmed

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Title:
  GTK display refresh rate is throttled

Status in QEMU:
  Confirmed

Bug description:
  Guest OS running with GL enabled GTK display shows a reduced refresh
  rate, e.g. moving cursor around with iGVT-g DMA Buf.

  Apparently, a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
  (30ms) is defined in include/ui/console.h, throttling the display
  refresh rate at 33Hz.

  To correct this throttle issue, a shorter interval (16 or 17
  milliseconds) should be applied to display change listener or the
  default value should be modified.

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[Bug 1802915] Re: GTK display refresh rate is throttled

[Thomas Huth]

The ticket has been re-opened here:

 https://gitlab.com/qemu-project/qemu/-/issues/700

... so let's keep this one here closed, please.

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #700
   https://gitlab.com/qemu-project/qemu/-/issues/700

** Changed in: qemu
       Status: Confirmed => Invalid

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Title:
  GTK display refresh rate is throttled

Status in QEMU:
  Invalid

Bug description:
  Guest OS running with GL enabled GTK display shows a reduced refresh
  rate, e.g. moving cursor around with iGVT-g DMA Buf.

  Apparently, a default refresh interval GUI_REFRESH_INTERVAL_DEFAULT
  (30ms) is defined in include/ui/console.h, throttling the display
  refresh rate at 33Hz.

  To correct this throttle issue, a shorter interval (16 or 17
  milliseconds) should be applied to display change listener or the
  default value should be modified.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1802915/+subscriptions