From: Moon-Sang Lee <sang0627@gmail.com>
To: dev@dpdk.org
Subject: [dpdk-dev] [Q] asymmetric ping latency over KNI
Date: Thu, 17 Sep 2015 13:30:05 +0900 [thread overview]
Message-ID: <CAACK=XdF6S1R-vY6PJzVR5nQZ-yriB-aaqw88JwmT+Kakn348Q@mail.gmail.com> (raw)
hello.
I installed dpdp-2.1.0 on my ubuntu 14.04 server where two NIC ports are
available.
There are two KNI interfaces, vEth0 and vEth1, for two NIC ports. (i.e. one
KNI for one NIC port)
And I connected two servers, M1 and M3, to each NIC port as below.
[ M1 ]--------eth0-[ M2 ]-eth1--------[ M3 ]
(vEth0) (vEth1)
After running KNI example in dpdk-2.1.0 source tree,
I pinged from M1 to M2(eth0) and from M3 to M2(eth1).
It shows short latency over M1-M2, but large latency (1 second) over M2-M3.
If I put "-i 0.2" option to ping, the large latency reduces to 200ms.
If I put "-i 0.x", then the latency becomes 0.x secnod.
I can't figure out what's wrong with my configuration and running
parameters.
Any comments are appreciated.
my runtime environment as follows.
# loading kni driver
insmod igb_uio.ko
insmod rte_kni,ko lo_mode=lo_mode_ring_skb
# execute kni example (i.e. packet burst size is the default, 32)
a.out -c 0x1414 -n 4 -- -p 0x3 -P --config="(0,2,4,6),(1,10,12,14)"
--
Moon-Sang Lee, SW Engineer
Email: sang0627@gmail.com
Wisdom begins in wonder. *Socrates*
reply other threads:[~2015-09-17 4:30 UTC|newest]
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