Re: [dpdk-dev] DPDK 17.02 RC-3 performance degradation of ~10%

["Mcnamara, John" <john.mcnamara@intel.com>]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Hanoch Haim (hhaim)
> Sent: Tuesday, February 14, 2017 11:45 AM
> To: dev@dpdk.org
> Cc: Ido Barnea (ibarnea) <ibarnea@cisco.com>; Hanoch Haim (hhaim)
> <hhaim@cisco.com>
> Subject: [dpdk-dev] DPDK 17.02 RC-3 performance degradation of ~10%
> 
> Hi,
> 
> We (trex traffic generator project) upgrade DPDK version from 16.07 to
> 17.02arc-3 and we experienced a performance degradation on the following
> NICS:
> 
> XL710  : 10-15%
> ixgbe   :  8% in one case
> mlx5    : 8% 2 case
> X710    :  no impact (same driver as XL710)
> VIC       : no impact
> 
> It might be related to DPDK infra change as it affects more than one
> driver (maybe mbuf?).
> Wanted to know if this is expected before investing more into this. The Y
> axis numbers in all the following charts (from Grafana) are MPPS/core
> which means how many cycles per packet the CPU invest. Bigger MPPS/core
> means less CPU cycles to send packet.

Hi,

Thanks for the update. From a quick check with the Intel test team they haven't seen this. They would have flagged it if they had. Maybe someone from Mellanox/Netronome could confirm as well.

Could you do a git-bisect to identify the change that caused this?

John