Hi,
I am trying to use rump kernel for Nginx. The motivation for me to use
the TCP stack in user space to achieve higher performance. Not sure if
someone has already done it ? Any pointers on this would be of much help to
us.
Before I start, I have a basic question ? Does the current rump kernel
support multiple processes? As you know, in Nginx we have master process
which creates several worker process. The master process creates the listen
socket and all the worker listens to that socket and the synchronization is
achieved through the mutex.
Now, can I link the rump kernel to the main process . Since the worker
processes fork from the parent, they will get the linked rump kernel
library along with it during the fork system call in their process address
space.
The parent process will open the listen 'socket' (here it is no longer a
socket, just a call to the rump kernel socket abstraction) and do a
select/epoll/kqueue (again a event loop abstraction). Each forked worker
process will inherit this listen 'socket'. The zero copy driver will
deliver packets to a user space fifo which will result in read activity
notification in the rump kernel select abstraction (this is no different
from a typical process of getting a packet on the NIC, servicing a network
hardware interrupt and going through the TCP state machine. Only here all
that happens in user space and interrupts are replaced by polling the
FIFO).
Is this supported ? Please let me know if I am wrong in my assumption.
Another thing I dont fully understand is how the rump kernel needs to
interface with the real kernel for other system calls. (system calls like
gettimeofday(), or fork, setbrk, other timer related calls or file system
calls) cannot be serviced by the rump kernel since it is only a library and
it will need to hand it over to the real kernel for all this.
Kindly let me know your thoughts.
Regards, Santos
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