On 6/20/07, John Polstra <[EMAIL PROTECTED]> wrote:
Julian Elischer wrote:
> Nicolas Cormier wrote:
>> Hi,
>>
>> I'm trying to write a little tcp-server kernel module (like tftp).
>> I didn't find a lot of documents about the kernel network programming,
>> just one thread which talks about netgraph.
>> In the freebsd includes I found /usr/include/sys/socketvar.h (so*).
>>
>> What's the easy way to create a basic tcp server
>> (create/bind/listen/accept/send/recv) : use netgraph's ksocket or so*
>> ?
>>
>> Thanks in advance !
>> PS: the whole job must be done in the kernel.
>
>
>
> yes it can (and has been) done..
> John Polstra did it many years ago.. using netgraph ksockets.
> He had an in-kernel web server.
> At least I THINK it was him :-)
Yes, that's right. I started out using netgraph ksockets, but later on
it evolved, mainly for performance reasons. (I needed it to be really,
really fast.) The first change was that I eliminated the ksockets and
worked directly at the link layer, using ng_ether nodes. I implemented
a small, stripped down TCP stack and bypassed the FreeBSD native
TCP/IP/socket layers. This was still done with netgraph, using just the
ng_ether nodes talking to my own ng_webclient / ng_webserver nodes. It
improved the performance immensely.
More recently I restructured it quite a bit to get better MP performance
using FreeBSD 7.x. (The original version was based on 4.x). I found
that the netgraph locking and internode communication mechanism impacted
performance too much under 7.x. So I eliminated the ng_ether nodes and
made the webserver / webclient nodes talk directly to the interfaces via
the if_input / if_output hooks. It still uses netgraph, but really only
as a configuration and management mechanism. No actual network traffic
flows between netgraph nodes. This change also resulted in a big
performance improvement.
Thx, I have started with ng_ksockets, for the now it is sufficient.
Unfortunately, my contract forbids me to release the source code publicly.
Bad news !
Thanks a lot for your answer, a last question "why did you not used
so* functions ?"
--
Nicolas Cormier
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