Regarding GPLPV, I am not aware of current issues or lack thereof.
However, I shouldn't think changing the number of cores would cause issues
for the driver (even changing to 1 for testing, the SMP HAL is already
installed and won't change automatically, but can run on a single core the
same as a Linux SMP kernel). OTOH, I can't tell you whether or not changing
the number of cores would affect activation, so you may want to hold off on
that. Hopefully James Harper will be in touch with you soon on this (or
someone else if they have answers).
Dustin
-----Original Message-----
From: John McMonagle [mailto:johnm@xxxxxxxxxxx]
Sent: Wednesday, March 09, 2011 16:22
To: Dustin.Henning@xxxxxxxxxxx
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Slow windows network with gplpv driver.
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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