Re: [Qemu-devel] [BUG] GTK terminal is broken

[Anthony Liguori <aliguori@us.ibm.com>]

Stefan Weil <sw@weilnetz.de> writes:

> Am 29.07.2013 20:05, schrieb Anthony Liguori:
>> Stefan Weil <sw@weilnetz.de> writes:
>>
>>> Hello,
>>>
>>> maybe most developers will already have noticed that the terminal output
>>> in QEMU's GTK user interface is broken. As far as I know, it never worked,
>>> but as there are working alternatives, I did not care much and forgot to
>>> report the issues.
>>>
>>> See these snapshots which show the problems with QEMU's GTK terminals:
>>>
>>> http://qemu.weilnetz.de/test/bugs/qemu-gtk-demo1.png
>>>
>>> Here the first line of the QEMUmonitor is only partially visible.
>>> Tested with Cygwin/X on W64 host, QEMU running on Debian Linux.
>>> Other X servers (e.g. native X on Debian Linux) don't show this
>>> problem.
>> It's a GTK/Cygwin/X bug.
>>
>> We use a vbox without anything particularly fancy happening.  Looks like
>> something is calculating layout incorrectly.
>>
>> Regards,
>>
>> Anthony Liguori
>
> I miss a comment on the more important next two points.
> They are _not_ related to Cygwin / X.
>
> Do you investigate them?

What you're seeing has always existed and is not GTK specific.  There is
not flow control on the outgoing side of serial emulation.  Data will
get dropped.

My guess is that your system is sufficiently slow and overloaded that
it's happening a lot for you.

Regards,

Anthony Liguori

>
>
>>> http://qemu.weilnetz.de/test/bugs/qemu-gtk-demo2.png
>>>
>>> This shows crippled output of "help" in the QEMU monitor
>>> (look for "default frequency" at the bottom of the page).
>>> Tested with several X servers.
>>>
>>>
>>> http://qemu.weilnetz.de/test/bugs/qemu-gtk-demo3.png
>>>
>>> This shows crippled output in the QEMU serial console.
>>> The Linux kernel boot messages are hardly readable.
>>> Tested with several X servers, x86 and mips kernels,
>>> GTK 2 and GTK 3.
>>>
>>>
>>> Regards,
>>>
>>> StefanW.