[Spice-devel] SPICE questions

[Izik Eidus]

On 03/11/2010 12:19 AM, Stefan Zintgraf wrote:
>
> Scott,
>
> I don't know if I have anything valuable information to contribute to 
> your questions but I'll try anyway.  Where the VM and the display on 
> the same physical machine?  I believe SPICE tries to figure out the 
> capabilities of both sides and balance the performance.  There might 
> be more overhead if both are on the same machine (guessing).
>
> There was no real difference if the display (SPICE client) was on the 
> same Linux machine or on a separate Windows system.
>
> What I am looking for is a fast solution for graphics integrated into 
> QEMU/KVM. I don't actually need the remote networking stuff.
>
> Everything should run on the same Linux machine.
>
> Alternatively VGA passthrough would be the solution, but currently it 
> does not exist for QEMU/KVM and it would introduce hardware dependencies.
>
> I am really wondering if running QXL/SPICE on the same machine 
> shouldn't be faster as the old QEMU way with emulating a standard VGA 
> card.
>

Hi,

While spice today not optimized to work loads of "running on the same 
machine"

(We can save alot of copys in that case, and we probably don`t want to 
use the spice server, but just
  the qxl device + canvas drawing)

In my personal opnion spice still superior to the performence of the 
Qemu cirrus device,
The reason is that spice is paravirtual graphics device.

thanks.

> Thanks
>
> Stefan
>
> -----Ursprüngliche Nachricht-----
> Von: Scott Dowdle [mailto:dowdle at montanalinux.org]
> Gesendet: Wednesday, March 10, 2010 9:03 PM
> An: Stefan Zintgraf
> Betreff: Re: [Spice-devel] SPICE questions
>
> Stefan,
>
> ----- "Stefan Zintgraf" <s.zintgraf at acontis.com> wrote:
>
> > I got it compiled and running now!
>
> >
>
> > I had to insert a lot of casts and do some tricking with the libasound
>
> > librar y (had to use the 32 bit one) and finally it compiled and even
>
> > started.
>
> >
>
> > But the results are quite disappointing with a Windows XP virtual
>
> > machine.
>
> >
>
> > In my virtual machine the "Red Hat QXL GPU" driver is installed as
>
> > well the "Red Hat Virtual Desktop Interface Port" driver.
>
> >
>
> > Compared with Microsoft Remote Desktop the results are disappointing
>
> > and even if I run QEMU without the qxl and spice option the results
>
> > are better.
>
> >
>
> > Has anybody an idea what I am doing wrong, how can I find out what may
>
> > be the reason?
>
> >
>
> > Another point: the spice client seems to be very unstable in specific
>
> > situations.
>
> >
>
> > When I opened MS Powerpoint and went to a specific slide with a lot of
>
> > graphics it regularly crashed without leaving any message. There was
>
> > no difference whether I used the self-compiled Linux client or the
>
> > downloaded Windows binaries.
>
> >
>
> > Especially the speed behavior is important for me to decide if using
>
> > SPICE is the right way to go and then to possibly contribute where
>
> > necessary.
>
> I don't know if I have anything valuable information to contribute to 
> your questions but I'll try anyway.  Where the VM and the display on 
> the same physical machine?  I believe SPICE tries to figure out the 
> capabilities of both sides and balance the performance.  There might 
> be more overhead if both are on the same machine (guessing).
>
> Gabe Knuth (the other guy on brianmadden.com) claimed in his article 
> about Virtual Bridges VERDE product... that the public bits of SPICE 
> that have been released are fairly unusable.  It came up with he asked 
> the VB folks if they are considering adopting SPICE.  The answer was 
> no, they'll use their modified VNC protocol which they claim is darn 
> fast too... and that SPICE was fairly broken.  Gabe said he was 
> gathering his facts and planning on doing an article about SPICE in 
> the near future.  This week though, they are doing GeekWeek where they 
> are installing a different VDI solution every day for 5 days 
> straight... documenting and videoing everything... and then after some 
> post-production time plan on releasing an article per day.
>
> Does anyone care to comment on the status and usability of SPICE 
> today?  Are the public bits that were released the same bits that Red 
> Hat is using in their RHEV for Desktops beta?
>
> TYL,
>
> -- 
>
> Scott Dowdle
>
> 704 Church Street
>
> Belgrade, MT 59714
>
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>
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>
>
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