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

[John McMonagle <johnm@xxxxxxxxxxx>]

Dustin

This is 4 of 8 real cores.

I started with 2.
Like to start testing a bit underpowered to see how things work.
Is there an issue with multiple cores or changing the number of cores?

John


On Wednesday, March 09, 2011 02:58:37 pm Dustin Henning wrote:
> 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
> > 
> > 
> > 
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users

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