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Date: Mon, 19 May 2014 11:30:34 +0200
From: Olivier MATZ <olivier.matz@6wind.com>
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Subject: Re: [dpdk-dev] [PATCH RFC 05/11] mbuf: merge physaddr and buf_len
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Hi Bruce,

> Can you perhaps also include the specific testpmd parameter you used in your tests, as they can have a large effect on performance. On my Sandy Bridge platform here are the testpmd flags I use for iofwd testing:
>
> "--rxd=128 --rxfreet=32 --rxpt=8 --rxht=8 --rxwt=0 --txd=512 --txfreet=32 --txpt=32 --txht=0 --txwt=0 --txrst=32 --txqflags=0xF01 --numa --burst=32 --mbcache=250 --total-num-mbufs=16383"

Sure.

Common arguments:
  -b 0000:07:00.0 -b 0000:07:00.1
  -b 0000:83:00.0 -b 0000:84:00.0
  -n 4
  -c 0x00ff00ff
  --socket-mem=2048,0
  --
  --port-numa-config=0,0,1,0,2,0,3,0
  --socket-num=0
  -i
  --burst=32
  --txd=512
  --rxd=512
  --mbcache=128
  --portmask=0xf

Simple rx/tx:
   --txqflags=0xf01

1c1t:
  --coremask=0x00000080 --rxq=1 --txq=1

1c2t:
  --coremask=0x00800080 --rxq=1 --txq=1

2c2t:
  --coremask=0x00000088 --rxq=1 --txq=1

2c4t:
  --coremask=0x00880088 --rxq=1 --txq=1

4c8t:
  --coremask=0x00cc00cc --rxq=2 --txq=2


By the way, I think the absolute performance numbers are not so
important in these tests. What is really important is to show the
relative impact of the patches.

Regards,
Olivier