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[Bug 1914667] Re: High cpu usage when guest is idle on qemu-system-i386

From: John Arbuckle
Subject: [Bug 1914667] Re: High cpu usage when guest is idle on qemu-system-i386
Date: Wed, 10 Feb 2021 18:50:03 -0000

After updating QEMU to 1214d55d1c41fbab3a9973a05085b8760647e411, I
reinstalled Windows XP and the host CPU usage at idle was normal. My
guess is that I picked a bad commit to reinstall Windows XP.

I tried using "-smp 4". Windows XP started up to a black screen. When I
restarted the problem with high CPU usage at idle was back. I did not
use the "-smp 4" option after restarting.

When I first specified the '-smp 4' option I saw Windows install
something then have the computer restarted.

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  High cpu usage when guest is idle on qemu-system-i386

Status in QEMU:

Bug description:
  When running Windows XP in qemu-system-i386, the cpu usage of QEMU is
  about 100% even when the guest CPU usage is close to 2%. The host cpu
  usage should be low when the guest cpu usage is low.

  Command: qemu-system-i386 -hda <Windows XP HD image>

  Using this command also shows around 100% host CPU usage:
  qemu-system-i386 -m 700 -hda <Windows XP HD image> -usb -device usb-audio 
-net nic,model=rtl8139 -net user -hdb mountable.img -soundhw pcspk

  Using the Penryn CPU option also saw this problem:
  qemu-system-i386 -hda <Windows XP HD image> -m 700 -cpu Penryn-v1

  Using "-cpu pentium2" saw the same high host cpu usage.

  My Info:
  M1 MacBook Air
  Mac OS 11.1
  qemu-system-i386 version 5.2 (1ba089f2255bfdb071be3ce6ac6c3069e8012179)
  Windows XP SP3 Build 2600

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