Hi, I have a question on netpoll and I think it is a good opportunity to ask my question in this thread, I have always wondered what is the use cases of netpoll anyway? Some months ago, I was designing a caching mechanism within the network stack. I was just polling in NF_IP_PRE_ROUTING and check some keys in my hash map if it is HIT then I will respond to the incoming request from the kernel via NETPOLL without engaging the real key-value store(Memcached) in the userspace! In miss cases I only let the request go through the kernel network stack and the Memcached application will respond to the request individually. I only update my hash my with respect the outgoing message in NF_IP_POST_ROUTING. I intended to reduce the latency of the key-value stores' requests at the data centers since these key-value stores are widely deployed in the data center at Facebook and Google. In my scenario, I only used netpoll as a hack to make my code working though, however, I never figure out, what problem netpoll intended to solve. Thank you, Alireza On Tue, Jul 17, 2018 at 8:21 PM <valdis.kletnieks@vt.edu> wrote:

On Tue, 17 Jul 2018 18:35:15 +0530, jitendra kumar khasdev said:

...

Can netpoll apis send data over the internet. It worked for me in local network but when I try to send data over server which is in cloud not able to send it.

Can anybody help me out ?

If it works over the local net, time to do the standard network debugging:

Does ping work to/from your cloud target? Does traceroute look sane? Does ssh/scp work? Are your routing tables correct at both ends? Is a firewall blocking it somewhere? Does 'netstat' show a program listening for your packets at the far end? _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies