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From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Date: Wed, 25 Feb 2015 10:18:58 +0100
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Cc: dev@dpdk.org, "Nemeth, Balazs" <balazs.nemeth@intel.com>
Subject: Re: [dpdk-dev] ixgbe vector mode not working.
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2015-02-24 23:36, Stephen Hemminger:
> On Wed, 25 Feb 2015 04:55:09 +0000
> "Liang, Cunming" <cunming.liang@intel.com> wrote:
> 
> > Hi Stephen,
> > 
> > I tried on the latest mater branch with testpmd.
> > 2 rxq and 2 txq as below, vector pmd on both rx and tx. I can't reproduced it.
> > I checked your log, on tx side, it looks the tx vector haven't enabled. (it shows vpmd on rx, spmd on tx).
> > Would you help to share the below params in your app ?
> > 	RX desc=128 - RX free threshold=32
> > 	TX desc=512 - TX free threshold=32
> > 	TX RS bit threshold=32 - TXQ flags=0xf01
> > As in your case which using 2 rxq and 1 txq, would you explain the traffic flow between them.
> > One thread polling packets from each rxq and send to the specified txq ?
> 
> Basic thread model of application is same as examples/qos_sched.
> 
> On ixgbe:
> 	RX desc = 4000 - RX free threshold=32
> 	TX desc = 512  - TX free threshold=0 so driver sets default of 32
> 
> I was setting rx/tx conf but since examples don't went away from that.
> 
> The whole RX/TX tuning parameters are a very poor programming model only
> a hardware engineer could love. Requiring the application to look at
> driver string and choose the magic parameter settings, is in my opnion
> an indication of using incorrect abstraction.

Yes, improvements are welcome.