* [Qemu-devel] [Bug 1445633] [NEW] Creating a passthrough USB device causes excessive CPU usage in the guest
@ 2015-04-17 19:20 P. J. Reed
2018-05-09 10:15 ` [Qemu-devel] [Bug 1445633] " Thomas Huth
2018-07-09 4:17 ` Launchpad Bug Tracker
0 siblings, 2 replies; 3+ messages in thread
From: P. J. Reed @ 2015-04-17 19:20 UTC (permalink / raw)
To: qemu-devel
Public bug reported:
My host machine is a Lenovo X1 Carbon (3rd gen) laptop running 64-bit Ubuntu Linux 14.04. My guest machine is running 64-bit Ubuntu Linux 12.04. My QEMU was compiled moments ago from the git repository, and it says its version is:
qemu-x86_64 version 2.2.93, Copyright (c) 2003-2008 Fabrice Bellard
My issue is that when I create a passthrough for a USB host device to
the guest, it causes qemu's CPU utilization on the host to increase
significantly and stay there. After the passthrough is created, qemu's
CPU usage in top hovers between 20% and 30% (evenly spread across CPUs).
In virt-manager's CPU usage chart, it shows the guest's CPU usage
growing from 0% to about 5%, although running "top" in the guest does
not show an increase in CPU usage. These usage levels drop back down to
normal (0 to 1%) only after I physically unplug the device or remove the
passthrough mapping.
It doesn't seem to matter what the device is. I have tested it using:
A Realtek rtl8192cu-based 802.11n adapter
An HP optical mouse
A Samsung Galaxy S5 phone
The behavior is the same regardless of device, and they otherwise seem
to work properly in the guest machine.
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1445633
Title:
Creating a passthrough USB device causes excessive CPU usage in the
guest
Status in QEMU:
New
Bug description:
My host machine is a Lenovo X1 Carbon (3rd gen) laptop running 64-bit Ubuntu Linux 14.04. My guest machine is running 64-bit Ubuntu Linux 12.04. My QEMU was compiled moments ago from the git repository, and it says its version is:
qemu-x86_64 version 2.2.93, Copyright (c) 2003-2008 Fabrice Bellard
My issue is that when I create a passthrough for a USB host device to
the guest, it causes qemu's CPU utilization on the host to increase
significantly and stay there. After the passthrough is created,
qemu's CPU usage in top hovers between 20% and 30% (evenly spread
across CPUs). In virt-manager's CPU usage chart, it shows the guest's
CPU usage growing from 0% to about 5%, although running "top" in the
guest does not show an increase in CPU usage. These usage levels drop
back down to normal (0 to 1%) only after I physically unplug the
device or remove the passthrough mapping.
It doesn't seem to matter what the device is. I have tested it using:
A Realtek rtl8192cu-based 802.11n adapter
An HP optical mouse
A Samsung Galaxy S5 phone
The behavior is the same regardless of device, and they otherwise seem
to work properly in the guest machine.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1445633/+subscriptions
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Qemu-devel] [Bug 1445633] Re: Creating a passthrough USB device causes excessive CPU usage in the guest
2015-04-17 19:20 [Qemu-devel] [Bug 1445633] [NEW] Creating a passthrough USB device causes excessive CPU usage in the guest P. J. Reed
@ 2018-05-09 10:15 ` Thomas Huth
2018-07-09 4:17 ` Launchpad Bug Tracker
1 sibling, 0 replies; 3+ messages in thread
From: Thomas Huth @ 2018-05-09 10:15 UTC (permalink / raw)
To: qemu-devel
Looking through old bug tickets... can you still reproduce this issue
with the latest version of QEMU? Or could we close this ticket nowadays?
** Changed in: qemu
Status: New => Incomplete
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1445633
Title:
Creating a passthrough USB device causes excessive CPU usage in the
guest
Status in QEMU:
Incomplete
Bug description:
My host machine is a Lenovo X1 Carbon (3rd gen) laptop running 64-bit Ubuntu Linux 14.04. My guest machine is running 64-bit Ubuntu Linux 12.04. My QEMU was compiled moments ago from the git repository, and it says its version is:
qemu-x86_64 version 2.2.93, Copyright (c) 2003-2008 Fabrice Bellard
My issue is that when I create a passthrough for a USB host device to
the guest, it causes qemu's CPU utilization on the host to increase
significantly and stay there. After the passthrough is created,
qemu's CPU usage in top hovers between 20% and 30% (evenly spread
across CPUs). In virt-manager's CPU usage chart, it shows the guest's
CPU usage growing from 0% to about 5%, although running "top" in the
guest does not show an increase in CPU usage. These usage levels drop
back down to normal (0 to 1%) only after I physically unplug the
device or remove the passthrough mapping.
It doesn't seem to matter what the device is. I have tested it using:
A Realtek rtl8192cu-based 802.11n adapter
An HP optical mouse
A Samsung Galaxy S5 phone
The behavior is the same regardless of device, and they otherwise seem
to work properly in the guest machine.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1445633/+subscriptions
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Qemu-devel] [Bug 1445633] Re: Creating a passthrough USB device causes excessive CPU usage in the guest
2015-04-17 19:20 [Qemu-devel] [Bug 1445633] [NEW] Creating a passthrough USB device causes excessive CPU usage in the guest P. J. Reed
2018-05-09 10:15 ` [Qemu-devel] [Bug 1445633] " Thomas Huth
@ 2018-07-09 4:17 ` Launchpad Bug Tracker
1 sibling, 0 replies; 3+ messages in thread
From: Launchpad Bug Tracker @ 2018-07-09 4:17 UTC (permalink / raw)
To: qemu-devel
[Expired for QEMU because there has been no activity for 60 days.]
** Changed in: qemu
Status: Incomplete => Expired
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1445633
Title:
Creating a passthrough USB device causes excessive CPU usage in the
guest
Status in QEMU:
Expired
Bug description:
My host machine is a Lenovo X1 Carbon (3rd gen) laptop running 64-bit Ubuntu Linux 14.04. My guest machine is running 64-bit Ubuntu Linux 12.04. My QEMU was compiled moments ago from the git repository, and it says its version is:
qemu-x86_64 version 2.2.93, Copyright (c) 2003-2008 Fabrice Bellard
My issue is that when I create a passthrough for a USB host device to
the guest, it causes qemu's CPU utilization on the host to increase
significantly and stay there. After the passthrough is created,
qemu's CPU usage in top hovers between 20% and 30% (evenly spread
across CPUs). In virt-manager's CPU usage chart, it shows the guest's
CPU usage growing from 0% to about 5%, although running "top" in the
guest does not show an increase in CPU usage. These usage levels drop
back down to normal (0 to 1%) only after I physically unplug the
device or remove the passthrough mapping.
It doesn't seem to matter what the device is. I have tested it using:
A Realtek rtl8192cu-based 802.11n adapter
An HP optical mouse
A Samsung Galaxy S5 phone
The behavior is the same regardless of device, and they otherwise seem
to work properly in the guest machine.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1445633/+subscriptions
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-07-09 4:30 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-04-17 19:20 [Qemu-devel] [Bug 1445633] [NEW] Creating a passthrough USB device causes excessive CPU usage in the guest P. J. Reed
2018-05-09 10:15 ` [Qemu-devel] [Bug 1445633] " Thomas Huth
2018-07-09 4:17 ` Launchpad Bug Tracker
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