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Oh, yes, I must not implement NAKs in this project, only ACKs. Acknowledgements are cumulative, i.e. if three packets were received, then I'll send ACK for the last (third) packet, which will mean that all tree packets got through. As for congestion: there's a receiver buffer and ACKs have a special field that tell how much more packets the sender can supply to receiver.

And none of them implement reliable delivery over UDP without implementing some form of ACK/NAK and sending limits. Reliable delivery of UDP is not a standard... The problem with UDP is that the senders/receivers cannot assume reliable delivery. Reliable delivery can only be supported at the application layer. The original statement was '"pseudo TCP" on top of UDP protocol'. I know TCP works differently. It...

Quote: Originally Posted by jpollard Yup - the application specified is using UDP, which doesn't block. That calls for something external to invoke the stall. In this case, I'd suggest a NAK when the count reaches the limit, and drop the data. So much misinformation in such few lines .... /UDP certainly does block, tho' for a smaller set of reasons. This "toy" case is presumable implemented in userspace making...

what do you mean? valhamdolelah

Thank you pollard for your reply. Could you tell me how can we vary the optimization levels.

Code: man gcc Then search for `Options That Control Optimization'

I have a code asmlinkage long sys_dxcastupdate(char *src) { if(src == NULL) printk(KERN_INFO"NULL POINTER"); else { printk(KERN_INFO"you entered %s",src); // update_dxcast_string(src); } return -EINVAL; } I compiled and run that kernel but there was a problem. When system boot up, it autoruns my system call and put a NULL to src. the problem is if src == NULL it must print NULL POINTER but in fact sometimes...

Just an update in case anybody follows this path. I ditched the java solution. It inspected the inner zip files perfectly, but the text processing was unacceptably slow. I went back to the original C++ implementation, but unpacked the top level zip file into a RAM drive. Performance was acceptable. I fear it won't scale well though. For this problem, fine. I also found that it is much better to have a compression other than zip. The...

somebody Please help me...........

You will have to explain yourself a bit better mate. Ibbo