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From: Sun Yalou <sunyalou@bupt.edu.cn>
To: users@dpdk.org
Subject: 82599ES 10-Gigabit NIC cannot at 10G speed for a long time
Date: Thu, 24 Nov 2022 04:42:06 +0000	[thread overview]
Message-ID: <8eaf46e68801e.ec7ca303cc0d3@bupt.edu.cn> (raw)

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Hi there,I'm developing a custom virtual switch using OVS-DPDK(v19.11.10). 
In order to achieve 10Gbit/s, I modified the OVS pmd mode from 
run-to-completion to pipeline. I used 1 thread as rx thread, 4 threads as 
worker thread and 1 thread as tx thread. it's a load balance archiecture.
I found the forwarding rate can reach 10Gbit/s in first 2 minite, and then 
drop to 5Gbit/s . My traffic generator keeps send packets at 10G rate. I 
debugged and found that packet loss occurred in `rte_eth_tx_burst`, then it 
invoke `ixgbe_xmit_pkts_vec` -> `ixgbe_xmit_fixed_burst_vec` , in 
`ixgbe_xmit_fixed_burst_vec`it should be `txq->nb_tx_free` < `nb_pkts`, it 
means there is not enough TX descriptor to be allocated.
I have tried increasing socket-mem when starting program and reducing the 
size of batch sent, neither worked. I wonder if i am missing something 
important? This question has been bugging me for weeks.
Does anyone know this issue? Thanks, BR, Yalou

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             reply	other threads:[~2022-11-28 22:30 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-24  4:42 Sun Yalou [this message]
2022-11-29 17:05 ` Stephen Hemminger

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