RE: [Xen-users] Slow windows network with gplpv driver.

["Dustin Henning" <Dustin.Henning@xxxxxxxxxxx>]

John,
        I am running an 0.9.x version of GPLPV, so forgive me if I am not up
to date on this, but in that version, having more than 1 core significantly
slowed down WindowsXP.  If this is still the case, and if it transfers to
Server 2003, then you might find better performance with 1 core, and if it
shouldn't still be true, then you might have found a new problem with the
GPLPV driver.  Another possibility is that the additional virtual cores are
being pinned to hyperthreads instead of real cores or something.  I am
making these suggestions under the assumption that you know making 4 virtual
cores on 2 real cores host would degrade performance for obvious reasons.
        Dustin

-----Original Message-----
From: John McMonagle [mailto:johnm@xxxxxxxxxxx] 
Sent: Wednesday, March 09, 2011 15:51
To: Dustin.Henning@xxxxxxxxxxx
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Slow windows network with gplpv driver.

Guess I'm mostly used to linux.
iperf is a very simple tests and doesn't take good of hardware to get close
to 
1gbits/sec with gbit  ethernet.

This machine will primarily do terminal services. it will access some files
on 
Linux server. 
We are a linux shop and that allows us to run some widows apps while keeping

all the users on linux terminals.

Did a test of the current server 2003 real server and it's getting 230 Mbits

/second.
Odds are the 160Mbits/second with SEP running will be Ok but I'd like to do 
better.
Watching Resource monitor in server 2008 cpu goes to 100% while running
tests.
Dom0 stays at 0%.

Ran into another strange thing.
I tried changing vcpus  from  from 2 to 4.
my networks speed dropped to 74 Mbits/s

If I revert back to 2 it comes back to 160.
What can cause that?
I have not activate yet in case that matters.

John



On Wednesday, March 09, 2011 10:37:25 am Dustin Henning wrote:
> 1) SEP adds a network layer, it is going to slow you down, this is going
to
> be amplified HVM processor virtualization.
> 2) You're calling 318 Mbit/sec "usable" on Windows?  Really?  That's
> impressive on Windows unless you have a 10 Gbit NIC.
> The only suggestion I would have for your scenario is don't virtualize. 
> I'm sure that's not what you want to hear, but I think you're asking too
> much. Dustin
> 
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of John McMonagle
> Sent: Wednesday, March 09, 2011 11:30
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Slow windows network with gplpv driver.
> 
> On Friday, March 04, 2011 02:32:25 pm John McMonagle wrote:
> > On Thursday 03 March 2011 09:13:39 pm John McMonagle wrote:
> > > On Thursday, March 03, 2011 05:57:21 pm you wrote:
> > > > > Just did a test with 32 bit xp with 0.11.0.238 drive.
> > > > > it show device as Xen Net device driver.
> > > > > 
> > > > > Iperf gives 14.7 Mbits/sec
> > > > > 
> > > > > Running an xp live boot cd  get 13.6 Mbits/sec
> > > > > Doesn't looks like the the pv driver is doing anything to help the
> > 
> > I tried on a AMD server  and it was about the same percentage
> > improvement. The only thing that had any noticeable affect was stopping
> > the windows firewall.
> > Had no change with  /PATCHTPR or  disable checksum offloading and large
> > send offloading.
> > 
> > The application seemed a bit more responsive I'll see what the users
say.
> > 
> > I'll try to install server 2008 next week and see what happens with
that.
> > Any one know any tricks to get single user Windows apps to behave in a
> > multi user environment?
> > 
> > John
> 
> I finally did an install of server 2008 on the same xen dom0.
> Before installing pv drivers get 43 Mbit/sec.
> better than double xp.
> 
> With pv driver 328 Mbit/sec.
> Not spectacular but usable.
> 
> Then I installed Synaptic Endpoint Protection.
> That brought me back to 162 Mbit/sec.
> 
> Any suggestions?
> 
> John
> 
> 
> 
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