Does the rte_eth_tx_burst() function is multi-threaded safe when sending pkt in same port and same queue ?
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The rx and tx functions are safe only if a queue is not shared by multiple threads (or the threads synchronize through some other mechanism). The safest design is to only use a queue on a single core. You will see different architectures in the examples. Some use one queue per core, and others use separate receive and transmit cores.
Quoted 10 lines · chen_lp
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But when I read the code of l2fwd (v1.5.1 examples), I found that two cores share only one queue of a port.
And it doesn't use any lock or other mechanism to ensure the safety.
How is it OK?
----- Original Message -----
From: "Stephen Hemminger" <[email protected]>
To: "chen_lp" <[email protected]>
Cc: <[email protected]>
Sent: Thursday, January 09, 2014 2:28 PM
Subject: Re: [dpdk-dev] Does the rte_eth_tx_burst() function is multi-threaded safe when sending pkt in same port and same queue ?
Quoted 6 lines
The rx and tx functions are safe only if a queue is not shared by multiple threads (or the threads synchronize through some other mechanism). The safest design is to only use a queue on a single core. You will see different architectures in the examples. Some use one queue per core, and others use separate receive and transmit cores.
Quoted 11 lines
Quoted 10 lines · chen_lp
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