Re: [dpdk-dev] [PATCH v3] fm10k: fix switch manager high CPU usage

[Bruce Richardson <bruce.richardson@intel.com>]

On Tue, Feb 16, 2016 at 08:34:21AM +0000, Chen, Jing D wrote:
> Hi,
> 
> Best Regards,
> Mark
> 
> 
> > -----Original Message-----
> > From: He, Shaopeng
> > Sent: Friday, February 05, 2016 10:46 AM
> > To: dev@dpdk.org
> > Cc: Chen, Jing D; Wang, Xiao W; He, Shaopeng
> > Subject: [PATCH v3] fm10k: fix switch manager high CPU usage
> > 
> > fm10k switch core uses source MAC + VID + SGLORT to do
> > look up in MAC table. If no match, an exception interrupt
> > will be sent to the switch manager. Too much of this kind
> > of exception interrupts cause switch manager side high CPU
> > usage.
> > To reproduce this issue, one DPDK testpmd runs on a server
> > with one fm10k NIC, mac forwards test traffic from one of
> > fm10k ports to another port. The CPU usage for the switch
> > manager will go up to about 20% for test traffic rate at
> > 10G bps, comparing to near 0% for no test traffic.
> > This patch fixes this issue. A default SGLORT is assigned
> > to each TX queue. This default value works for non-VMDq mode
> > and current VMDq example. For advanced VMDq usage, e.g.
> > different source MAC address for different TX queue, FTAG
> > forwarding function could be used to change this default
> > SGLORT value.
> > 
> > Fixes: 9ae6068c ("fm10k: add dev start/stop")
> > 
> > Signed-off-by: Shaopeng He <shaopeng.he@intel.com>
> Acked-by : Jing Chen <jing.d.chen@intel.com>

Applied to dpdk-next-net/rel_16_04

Thanks,
/Bruce