[dpdk-dev] Testing memnic for VM to VM transfer
Hiroshi Shimamoto
h-shimamoto at ct.jp.nec.com
Wed Jun 18 06:02:20 CEST 2014
Hi,
> Subject: [dpdk-dev] Testing memnic for VM to VM transfer
>
> Hi everyone:
> We are interested in testing the performance of the memnic driver posted at http://dpdk.org/browse/memnic/refs/.
> We want to compare its performance compared to other techniques to transfer packets between the guest and the kernel,
> predominately for VM to VM transfers.
>
> We have downloaded the memnic components and have got it running in a guest VM.
>
> The question we hope this group might be able to help with is what would be the best way to processes the packets in the
> kernel to get a VM to VM transfer.
I think there is no kernel code work with MEMNIC.
The recommend switching software on the host is Intel DPDK vSwitch hosted on 01.org and github.
https://github.com/01org/dpdk-ovs/tree/development
Intel DPDK vSwitch runs on userspace not kernel.
I introduced this mechanism to DPDK vSwitch and the guest drivers are maintained in dpdk.org.
thanks,
Hiroshi
>
> A couple options might be possible
>
>
> 1. Common shared buffer between two VMs. With some utility/code to switch TX & RX rings between the two VMs.
>
> VM1 application --- memnic --- common shared memory buffer on the host --- memnic --- VM2 application
>
> 2. Special purpose Kernel switching module
>
> VM1 application --- memnic --- shared memory VM1 --- Kernel switching module --- shared memory VM2 --- memnic ---
> VM2 application
>
> 3. Existing Kernel switching module
>
> VM1 application --- memnic --- shared memory VM1 --- existing Kernel switching module (e.g. OVS/linux Bridge/VETh pair)
> --- shared memory VM2 --- memnic --- VM2 application
>
> Can anyone recommend which approach might be best or easiest? We would like to avoid writing much (or any) kernel code
> so if there are already any open source code or test utilities that provide one of these options or would be a good starting
> point to start from, a pointer would be much appreciated.
>
> Thanks in advance
>
>
> John Joyce
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