[Spice-devel] keypress-delay issue

[Jared Kwek]

Hi,

Thanks for your reply.

 

 

 

-----Original Message-----
From: Marc-André Lureau <mlureau at redhat.com>
To: jkwek1 <jkwek1 at aol.com>
Cc: spice-devel <spice-devel at lists.freedesktop.org>
Sent: Sun, May 31, 2015 2:32 pm
Subject: Re: [Spice-devel] keypress-delay issue



Hi

----- Original Message -----
> Hi all,
> 
> I've noticed a typing
delay in my VM's through the SPICE protocol when typing
> emails or text files.
It's noticeable to the point that it is hurting my
> typing speed and is
contributing to more mistakes (as the letters appear
> after the slight delay).
I'm running Fedora 21 on the host and VM and the VM
> resides locally
(localhost). Searches on the matter brought me to a couple
> of threads on this
list where people had similar issues:
> 
>
http://lists.freedesktop.org/archives/spice-devel/2012-October/011317.html
>
http://lists.freedesktop.org/archives/spice-devel/2014-June/016992.html
>


It was discussed several time in the past, last I remember the issue is
mainly with Windows guests,

There are some hints to solve it in this
page:
http://serverfault.com/questions/624690/windows-guest-on-kvm-qemu-suffers-horrible-key-lag

Yes I saw this too when researching.  However my guest is Fedora 21, not Windows.

(iirc,
using a usb keyboard would solve it too)

I did see this also and played around with changing the input type of the keyboard to USB in my xml file.  However it appears that QEMU creates the PS/2 keyboard regardless and thus I end up with two keyboards and not sure which it is using.  I saw the same lag with this approach.

> As far as I can tell, there's no
way to configure this through the various
> spice clients I have available to
me; the only option for me is to recompile
> spice-gtk with a different value
for keypress-delay. I would love to see an
> option to configure this or change
the code to auto-tune it to disable it on
> localhost connections. Any thoughts
on implementing this?

I am not convinced at this point that the
keypress-delay is problematic. Do you have a particular use case, or simply text
typing?

Use case is any sort of regular typing in a VM, whether in gedit, vi in a terminal window, or typing an email in a browser window.  It is a slight but noticeable delay when typing in the VM vs. on the physical host.  The VM is running locally so I don't need there to be any delay to compensate for network conditions.  

In the link from 2014 I previously posted, the person who recompiled with 10ms value for keypress-delay saw a huge improvement in the overall feel.  My hope for a solution is that the keypress-delay can be auto-tuned based on network conditions or user configurable.  Thank you for considering this.

thanks


Thanks,
Jared Kwek

 
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