[Spice-devel] Unfair comparisons with RDP
John A. Sullivan III
jsullivan at opensourcedevel.com
Thu Jun 30 11:42:55 PDT 2011
On Thu, 2011-06-30 at 20:21 +0200, Alon Levy wrote:
> On Thu, Jun 30, 2011 at 02:01:48PM -0400, John A. Sullivan III wrote:
> > On Thu, 2011-06-30 at 10:10 +0300, Yaniv Kaul wrote:
> > > On 06/30/2011 05:33 AM, John A. Sullivan III wrote:
> > > > On Wed, 2011-06-29 at 20:22 -0400, Andrew Cathrow wrote:
> > > >>
> > > >> ----- Original Message -----
> > > >>> <snip>
> > > >>> Hello, all. I've been using both RDP via TSPlus and SPICE for over a
> > > >>> week now and the practical world results at least in my mode of
> > > >>> operation are becoming clear. SPICE does handle major screen refreshes
> > > >>> better, e.g., monstrous graphics or continuously pasting a full line
> > > >>> of
> > > >>> text in a full screen notepad. Of course, SPICE is a clear winner when
> > > >>> it comes to video though still not practically usable on low bandwidth
> > > >>> links.
> > > >>>
> > > >>> However, RDP is trouncing SPICE in the more common day to day tasks
> > > >>> involving small screen updates. For example, every time I open or
> > > >>> switch
> > > >>> my screen to LibreOffice, the tool bar icons seems to pain one at a
> > > >>> time
> > > >>> in SPICE where as they appear all at once in TSPlus. Document
> > > >>> scrolling
> > > >>> is more immediate and smoother. Surprisingly, when I open the PuTTY
> > > >>> dialog in SPICE, it paints in sections whereas TSPlus appears all at
> > > >>> once.
> > > >> You'll really need to post some real details here - from versions of qemu+spice server that you're using along with the qemu command line syntax, host OS, hardware details through to what's running in the guest, driver versions, etc.
> > > >>
> > > >> I've never seen RDP trounce spice, but if it does, then we need some scientific information on the environment so we can diagnose and assist.
> > > >>
> > > > <snip>
> > > > Very happy to do so as we really do want SPICE to become our protocol of
> > > > choice. I believe I've posted up our details before but will do so
> > > > again.
> > >
> > > Would you be so kind as to capture the Spice traffic (using
> > > tcpdump/wireshark) and send it over?
> > > Specifically:
> > > 1. Please capture from start - before the Spice client connects to the
> > > server.
> > > 2. Ensure you catch full sized packets (-s XXXX - could be 1500 most
> > > likely, when using tcpdump)
> > > 3. Save into file (-w /tmp/file.pcap when using tcpdump)
> > > 4. Please compress and send / let me know where I can pick it up from.
> > >
> > > I suggest you have only the scenario of connecting to the VM and opening
> > > putty, which you complain is slow.
> > > Hopefully it'll give us some clue.
> > > TIA,
> > > Y.
> > <snip>
> > Certainly. On their way in a couple of moments. If anyone else would
> > like a copy, please let me know off list.
> > I took three traces. The first was our regular SPICE connection. Then
> > I took a trace performing the same activities using xfreerdp and TSPlus.
> Is the vm a windows or linux one?
Sorry - the VM is Windows Server 2008, client is Debian Squeeze, host is
Fedora 15 - John
> > Once again, it was much more responsive and it transferred roughly 1/5th
> > of the data SPICE did. I also noticed it said it did not support 32 bit
> > pixel depth and reverted to 16 although it looked much better than 16.
> > I then thought, our iSCSI disk access is slow so maybe it was a matter
> > that all the data was now cached plus the 16 vs 32 bit pixel depth, so I
> > took another SPICE trace with color-depth=16. It was still much slower
> > and transferred many times the amount of data. I'll paste in the timing
> > notes that are included in the trace tarball. One can get a anecdotal
> > sense of how much snappier RDS is from the time lines on doing the exact
> > same activities:
> > SPICEStart-20110630 sequence
> > 0 seconds: start spicec --host 172.x.x.124 --port 5900 --color-depth 32
> > -to previously painted screen
> > 20: toggle to full screen
> > 45: display desktop, i.e., minimize all open applications
> > 64: Open PuTTY
> > 81: Paint existing LibreOffice document, i.e., restore from minimize
> > 104: Start new LibreOffice application after closing previous one
> > 120: Open LibreOffice document (slowly paints toolbar icons)
> > 136: toggle away from full screen
> > Total bytes transfered: 2,687,446
> > TSPlusStart-20110630 sequence
> > 0 seconds: start xfreerdp -d MyDomain -a 32 -x lan -z -u myid -f
> > --plugin cliprdr --plugin rdpsnd 172.29.1.133 & - said it did not
> > support 32 bit pixel depth and reverted to 16 although it looked much
> > better than 16 bit
> > 7: login
> > 17: display desktop, i.e., minimize all open applications
> > 28: Open PuTTY
> > 42: Paint existing LibreOffice document, i.e., restore from minimize
> > 58: Start new LibreOffice application after closing previous one
> > 75: Open LibreOffice document (slowly paints toolbar icons)
> > 85: toggle away from full screen
> > Total bytes transfered: 562242
> > SPICEStart-16-20110630 sequence
> > 0 seconds: start spicec --host 172.x.x.124 --port 5900 --color-depth 16
> > (Warning: no factory for 8 - I don't know what that message means)
> harmless, it means spicec is not compiled with smartcard channel support.
> > 15: toggle to full screen
> > 39: login
> > 61: display desktop, i.e., minimize all open applications
> > 75: Open PuTTY
> > 92: Paint existing LibreOffice document, i.e., restore from minimize
> > 114: Start new LibreOffice application after closing previous one
> > 138: Open LibreOffice document (slowly paints toolbar icons)
> > 153: toggle away from full screen
> > Total bytes transfered: 3643123 (I assume this is higher than 32bit
> > because of the screen resolution detection when logging in)
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