[dpdk-dev] RES: RES: l2fwd high latency/delay

Fred Pedrisa fredhps10 at hotmail.com
Thu Mar 27 03:26:49 CET 2014



I see, but even making it’s value as 1, still doesn’t help ? :/


De: Masaru Oki [mailto:m-oki at stratosphere.co.jp] 
Enviada em: quarta-feira, 26 de março de 2014 23:18
Para: Fred Pedrisa
Cc: dev at dpdk.org
Assunto: Re: [dpdk-dev] RES: l2fwd high latency/delay


there is problem in l2fwd_send_packet().

l2fwd and some other examples assume burst traffic.
l2fwd doesn't send packet if qconf->tx_mbufs[port].len < MAX_PKT_BURST.


2014-03-27 9:56 GMT+09:00 Fred Pedrisa <fredhps10 at hotmail.com>:

It is just a ping test, from one PC to another, using 2 ports as a L2

64 bytes from icmp_seq=967 ttl=128 time=1630 ms
64 bytes from icmp_seq=968 ttl=128 time=5005 ms
64 bytes from icmp_seq=969 ttl=128 time=4004 ms
64 bytes from icmp_seq=970 ttl=128 time=3003 ms
64 bytes from icmp_seq=971 ttl=128 time=3661 ms
64 bytes from icmp_seq=972 ttl=128 time=2660 ms
64 bytes from icmp_seq=973 ttl=128 time=1660 ms
64 bytes from icmp_seq=974 ttl=128 time=3001 ms
64 bytes from icmp_seq=975 ttl=128 time=2001 ms
64 bytes from icmp_seq=976 ttl=128 time=1000 ms
64 bytes from icmp_seq=977 ttl=128 time=0.713 ms
64 bytes from icmp_seq=978 ttl=128 time=3000 ms
64 bytes from icmp_seq=979 ttl=128 time=2000 ms
64 bytes from icmp_seq=980 ttl=128 time=1000 ms
64 bytes from icmp_seq=981 ttl=128 time=4003 ms
64 bytes from icmp_seq=982 ttl=128 time=3001 ms
64 bytes from icmp_seq=983 ttl=128 time=4654 ms
64 bytes from icmp_seq=984 ttl=128 time=3654 ms
64 bytes from icmp_seq=985 ttl=128 time=2654 ms

However, this is what happens :-(

-----Mensagem original-----
De: dev [mailto:dev-bounces at dpdk.org] Em nome de Fred Pedrisa
Enviada em: quarta-feira, 26 de março de 2014 20:34
Para: dev at dpdk.org
Assunto: [dpdk-dev] l2fwd high latency/delay


I am testing l2fwd in FreeBSD and I am noticing a delay of around 0~3
seconds, what could be causing this behavior ?



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