Re: [Xen-devel] Performance numbers on PV-on-HVM

[Jagadish Nadimpalli <jagadish.nadimpalli@xxxxxxxxxxxxxxxxxx>]

Hi Stefano,

Thanks for your response. Please find my responses inline.

On Mon, Sep 27, 2010 at 3:52 PM, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> wrote:

On Sat, 25 Sep 2010, Jagadish Nadimpalli wrote:
> Hi,
>
> I measured network performance with netperf on PV-on-HVM:
> Guest Kernel is taken from git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git.

The most up to date branch is 2.6.35-rc5-pvhvm-v7, please use it for
your tests.

 

I will use the latest branch.

Also make sure that the PV interfaces are actually running, in
particular use the right name for the root device ('/dev/xvda',
if you are using 'hda' in your VM config file).

 

Could you please let me know where(config file) can I configure/verify the name for root device.
 

Since I am testing network performance, I verified which network interface is used in the PV-on-HVM VM. I found that there is no Ethernet device displayed in the lspci output of VM. Here is the lspci output on PV-on-HVM VM. The Xen platform device is displayed in lspci. This means that the platform device is used as PV driver in the PV-on-HVM guest. Please correct me if I am wrong.

===========================================================
00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
00:01.2 USB Controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] (rev 01)
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 01)
00:02.0 VGA compatible controller: Cirrus Logic GD 5446
00:03.0 Class ff80: XenSource, Inc. Xen Platform Device (rev 01)
00:05.0 Multimedia audio controller: Ensoniq ES1370 [AudioPCI]
===========================================================

> Xen hypervisor is taken from http://koji.fedoraproject.org/koji/taskinfo?taskID=2478501.

I couldn't find the download link for xen-4.0.1-1.fc13.1.src.rpm but I
found the download link for xen-4.0.1-1.fc14.1.src.rpm and it contains
all the bits needed.

> Dom0 Kernel is taken from git://git.kernel.org/pub/scm/linux/kernel/git/jermy/xen.git and switched to stable branch
> xen/stable-2.6.32.x).
> The Kernel configuration is taken from
> http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.32.21-pvops-dom0-xen-stable-x86_64.
>
> The tutorial mentioned that the Kernel configuration has debug enabled and there will be a performance hit but I first
> wanted to get the setup UP and get some performance numbers(I will get the performance numbers by disabling the debug
> parameters in Kernel config and I will let you know those performance numbers). With the above combination, I am able to
> get the PV-on-HVM guest up and running.
>
> My machine has the following harware configuration.
> (1) Chipset - Intel 82Q35
> (2) Processor - Intel Core2 Duo CPU E8400 @ 3.00GHz
>

Performance results might vary significantly depending on whether the
cpu supports EPT or not. Could you please cat /proc/cpuinfo?
If this cpu doesn't support EPT, it might be worth changing test
hardware :)

 

Here is the cat /proc/cpuinfo output:
==================================================
processor    : 0
vendor_id    : GenuineIntel
cpu family    : 6
model        : 23
model name    : Intel(R) Core(TM)2 Duo CPU     E8400  @ 3.00GHz
stepping    : 10
cpu MHz        : 2992.566
cache size    : 6144 KB
physical id    : 0
siblings    : 2
core id        : 0
cpu cores    : 1
apicid        : 0
initial apicid    : 0
fpu        : yes
fpu_exception    : yes
cpuid level    : 2
wp        : yes
flags        : fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov pat clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good pni est ssse3 cx16 sse4_1 hypervisor lahf_lm
bogomips    : 5985.13
clflush size    : 64
cache_alignment    : 64
address sizes    : 36 bits physical, 48 bits virtual
power management:

processor    : 1
vendor_id    : GenuineIntel
cpu family    : 6
model        : 23
model name    : Intel(R) Core(TM)2 Duo CPU     E8400  @ 3.00GHz
stepping    : 10
cpu MHz        : 2992.566
cache size    : 6144 KB
physical id    : 0
siblings    : 2
core id        : 0
cpu cores    : 1
apicid        : 1
initial apicid    : 1
fpu        : yes
fpu_exception    : yes
cpuid level    : 2
wp        : yes
flags        : fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov pat clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good pni est ssse3 cx16 sse4_1 hypervisor lahf_lm
bogomips    : 5985.13
clflush size    : 64
cache_alignment    : 64
address sizes    : 36 bits physical, 48 bits virtual
power management:
=============================================================
 

> Performance setup:
> ==============
> The dom0's Ethernet interface is connected to LAN. The netserver is running on another host that is connected to LAN. The
> netperf client is running on the PV-on-HVM guest. So, we are measuring performance from PV-on-HVM guest to a host on LAN.
> Using netperf, the performance numbers in Mbps are 723, 719, 703, 735, 709, 733 for 6 trails.
>
> Are there any published performance numbers with PV-on-HVM guest? I want to compare my numbers with the published ones.
>

I ran few kernbench a while back, these are the test results:

http://lists.xensource.com/archives/html/xen-devel/2010-05/msg01176.html

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