Triaging old bug tickets ... Can you still reproduce this problem wit
the latest release of QEMU (currently version 2.9.0), or could we close
this bug nowadays?
** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1099403
Title:
High CPU utilization in vnc mode
Status in QEMU:
Incomplete
Bug description:
We start a gentoo guest using ./x86-64-softmmu/qemu-x86-64 -hda
<disk>.qcow2 -vnc :6.
Then we start a vncviewer session to this guest from a remote
computer. In this session, we start a video. After starting the video,
the CPU utilization of the guest (the qemu-x86-64 process) increases
to about 90%. The high CPU utilization persists even after closing the
vncviewer session.
However, the CPU usage while running a video inside a gentoo guest
(without a remote computer connecting via vncviewer) is only 20-30%.
So we suspect the high CPU usage to be due to the vncserver code
running inside QEMU which has to do a lot of work to send the
framebuffer updates to the client.
My question is why does the usage not decrease when the remote
vncviewer is disconnected? On simple computers (no virtual guests),
the CPU usage of vncserver decreases drastically when the vncviewer
client is disconnected. Why does this not happen in the vncserver
provided by QEMU (through -vnc :6).
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