what does txqueuelen:0 mean on a NIC?

what does txqueuelen:0 mean on an interface?  

shouldn't it be set to a number? 

would it at any point effect my UDP traffic?

thank you,
what does txqueuelen:0 mean on a NIC?
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what does txqueuelen:0 mean on an interface?  

shouldn't it be set to a number? 

would it at any point effect my UDP traffic?

thank you,