[dpdk-dev] limited tx performance with VMware VM + PCI pass-through

[martin_curran-g...@keysight.com]

Hello Grisha,

I'm not sure which OS you are using.

We encountered  a problem moving from sandybridge based machines to haswell 
based machines, with using  pass-through to VMs.

We had to change to a newer version of our OS since the one we used was too old 
to understand the haswell.

We intially saw a huge drop in DPDK performance in the vms, native was fine.

There were changes required in the configuration of the vms, to do with huge 
pages and anonymous huge pages, and VM backing with huge pages

Not sure if this helps

Martin


Martin Curran-Gray
HW/FPGA/SW Engineer
Network Monitoring

Keysight Technologies UK Ltd

web -> http://www.keysight.com

[dpdk-dev] limited tx performance with VMware VM + PCI pass-through

[Grisha Freilikhman]

Setup
ThinkServer RD650, Intel Xeon E5-2680 v3
2*x710 ports pass-through (i40e driver)
Dpdk 2.1
Dpdk app doing forwarding from one port to another

Results
When more than 7.5(50% of wire speed) MPPS sent with 64 bytes, Tx 
fails(rte_eth_tx_burst return with less than given packets to send).
Rx on 1 port -> output 7.5 MPPS
Rx on 2 ports -> each outputs 3.75 MPPS (total 7.5)

This behavior happening only in virtual environment, bare Linux there 
is wire speed performance.

Question
Is there any known issue? Or someone found encountered and fixed this?


Thanks,
Grisha Freilikhman
SW Engineer
Allot Communications
Tel +972 9 7628476
Cell +972 54 3063662
gfreilikhman at allot.com 
www.allot.com