Hi, I am emanshu "munish nayyar" a linux enthusiastic. I need your help. I am using PF_PACKET socket ( kernel-2.4.25 configured with mmap packet capture support) to receive video stream coming at particular port. But the problem when the stream is coming at high rate, kernel starts dropping packet it seems that udp_queue buffer is full. So then I changed my approach of socket creation I update my software socket to PF_PACKET socket like that!! Fd=socket(PF_PACKET, SOCK_DGRAM, ETH_P_IP) // since I need only IP based udp packet so filtering at Ethernet level.
And I am receiving the packet using, Bytes_recv=recvfrom() call still I am unable to receive the packet if stream is coming more than 5mbps. Some linux gurus advice me to use mmap based PF_PACKET, they told me that this will surely improve your performance upto large extent, then I build my kernel with mmap packet capture support and run me apps on that kernel still problem continue .
Please tell me where I am wrong!! does there any extra step other than socket creation and recvfrom() call is required to use mmap() packet capture!!
I will really appreciate any help to me!
Thanks, Munish Nayyar