[Spice-devel] aspeed: video frames pass-through

[Christophe Fergeau]

On Thu, Nov 12, 2015 at 08:29:07PM +0300, Anton D. Kachalov wrote:
> Hello.
> 
> 03.11.2015, 19:17, "Anton D. Kachalov" <mouse at yandex-team.ru>:
> > 03.11.2015, 18:43, "Christophe Fergeau" <cfergeau at redhat.com>:
> >>  Hmm, not very familiar with ARM, and not sure this has seen a lot of
> >>  testing. Maybe getting a backtrace would shed more light?
> >
> > I'll try rewritten version with original proto spec (packed int8/int16) to check what we have now.
> 
> Framerate is low. Very low (~0.5 FPS). Like a slideshow for video
> streaming. Each frame's update traps:
> 
>    http://pastebin.com/Hz2k8gSJ

Hmm, would you have a way to get a backtrace when this happens? Maybe
there are only a few places which needs to be fixed to avoid these
traps?

> 
> Would it be enough to disable "packed" attribute for structures?
> Marshall/demarshall code just add/consume data of the requested size
> direct from/to the fields. No casts / memcpy. Chunks are fine too?

As far as I know, the marshalling/demarshalling code uses the structs
from spice-common/common/messages.h which are not packed.

> >
> > One more thing that I would like to raise.
> > I'm doing keycode/scancode pass to the emulated USB HID. USB
> > scancodes is different to XT codes. Is there exists any general
> > mapping functionality? I mean the following mapping:
> > https://www.win.tue.nl/~aeb/linux/kbd/scancodes-14.html for the US
> > layout.
> 
> I've added hardcoded keymaps for US layout using keymaps.csv file. It looks a little ugly.

Not very familiar with this, this issue did not seem to happen for
spice-clients/qemu+spice-server. I assume because the kernel or qemu are
doing some remapping for us(??)

Christophe
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