Re: PV network performance comparison

[Dor Laor <dor.laor-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

James Dykman wrote:
> Dor,
>
> I ran some netperf tests with your PV 
> virtio drivers, along with some Xen PV cases
> and a few others for comparison. I thought you
> (and the list) might be interested in the numbers. 
>
>   
Thanks for the tests it indeed interesting.
Actually except for a small optimization (receiving several msgs from 
the tap and sending a single irq) I
haven't had the time to optimize the code. It's also interesting to 
check what lguest is doing since the
qemu path is not polished, also lguest has newer virtio drivers.
> I am going to start looking for bottlenecks, unless
> you need help with the new hypercall updates.
> I'll re-run when that is available.
>
>   
Any help would be great. I also need to move towards the latest virtio 
patch that includes
a change in the shared memory and pci like config space. I planned on 
doing this starting mid next week.

W.r.t performance the following can improve:
 - Avi's shorten latency tap patch
 - Using scatter gather in qemu tap
   That's why using bigger pkts don't help performance.
 - Minimize guest tx hypercalls
 - Running oprofile
 - Host side kernel driver.

Thanks,
Dor.
> Jim
>
> Tests were run with Netperf-2.4.3, TCP Socket 
> buffers were 256k. All of the tests were run with
> netserver in the guest, netperf in the host/dom0.
> No bridge was used.
>
> Hardware: IBM HS21 blade 
>         Dual Xeon w/HT @ 1.6GHz, 4GB
>
> The host/Dom0 configuration:
> kvm.*:
>         Host is 32 bit Ubuntu 7.04 server running
>         Dor's 2.6.22-rc3 kernel.
> xen.*:
>         Dom0 is 32 bit Ubuntu 7.04 server running
>         the 2.6.18 kernel from xen3.1
>
> The guest configurations:
> All guests/domUs are 512MB, 1 CPU
> kvm.rtl: (KVM with emulated RTL8029)
>         Fedora 7 32 bit guest
>         Standard 2.6.21-1.3194.fc7 kernel
> kvm.pv: (KVM w/Dor's paravirt drivers)
>         Fedora 7 32 bit guest running 
>         Dor's 2.6.22-rc3 kernel. 
> xen.pv: (Xen paravirt)
>         Ubuntu 7.04 server w/2.6.18-xen kernel 
> xen.um: (Xen HVM with unmodified drivers)
>         Ubuntu 7.04 server w/2.6.18-xen kernel, 
>         unmodified drivers compiled from xen3.1 
> kvm.lo: (Host loopback)
>
> TCP REQUEST/RESPONSE (Trans. Rate per sec)
> size  kvm.rtl  kvm.pv    xen.pv    xen.um    kvm.lo
> 1     2191.47  9533.74  18052.37  13593.58  42400.73
> 64    2184.30  9518.13  17979.93  13557.98  42260.53
> 128   2177.52  9482.45  17940.08  13588.54  40983.90
> 256   2160.49  9465.97  17788.21  13492.42  41170.45
> 512   2130.99  9403.33  17655.11  13489.64  40765.26
> 1024  2074.85  9204.90  17293.06  13572.01  39437.78
> 2048   416.18  4750.41  12907.57  11571.07  37252.42
> 4096   265.22  3691.90  10990.67   9943.64  31905.03
> 8192   116.80  1892.25   8439.83   6604.64  24397.95
> 16384   92.06  1004.58   4535.86   3924.68  17460.30
>
> TCP STREAM (Throughput 10^6bits/sec)
>   size    kvm.rtl  kvm.pv   xen.pv   xen.um  kvm.lo
>    2048    33.06   507.21   555.94  1442.38  5409.73
>    4096    33.16   526.75   848.26  2359.42  6152.48
>    8192    33.13   527.99   997.69  2418.87  7267.73
>   16384    33.08   525.95  1107.64  2379.50  8434.29
>   32768    33.13   525.38  1199.08  2375.81  8857.09
>   65536    33.20   523.39  1255.33  2473.92  9248.35
>  131072    33.11   520.87  1292.54  2605.49  8559.21
>
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>   


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