Whoops I guess hitting enter sent the email early.
The code looks roughly like such. The distance between the DD and EOP
checks and using packet contents is very short.
; rax points to the ring descriptor, thus rax+8 points to the status
.poll:
bt qword [rax + 8], 32 ; DD
jnc short .poll
bt qword [rax + 8], 33 ; EOP
jnc short .poll
mov rdi, qword [rax + 0] ; Get the pointer to the packet from the
descriptor
movzx rbp, word [rax + 8] ; Get the length of the packet
; Zero out the status
mov qword [rax + 8], 0
; Here is where I insert the mfence/sfence/sleep which fixes the problem
; From here I do UDP length validation on the packet, and the packet is not
; present yet, thus the UDP length is not updated.
------------------------------------------------------------------------------
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