[Serdev] tcp_send

[Katty Xiong]

--- Andrei Pelinescu-Onciul <andrei at iptel.org> wrote:

> On Jan 26, 2007 at 09:42, samuel <samu60 at gmail.com>
> wrote:
> > In a recent post Andrei (please correct me if I'm
> wrong) already
> > noticed this and said it is on the TODO list.
> > 
> 
> Yes, it's on my todo list (and since a very long
> time  on the
> sip_router/TODO list under the fd cache for tcp_send
> name).
> In fact (as the fd cache name implies) I want to do
> more then this, I
> want to cache the last used n fds in the sender
> process (where n is
>  a small number, like 4 or 5). Because of these I
> would probably replace
>  the close() in tcp main with shutdown().

As I can see from the code, fd is a field in 
tcp_connection. So if tcp_send() knows the pointer of
the tcp_connection, it aotomatically knows fd, right?
Unless there are some cases that the the filed fd is
removed in the tcp_connection.

thanks,
Joy

> 
> Another problem spot in tcp is the tcp timer which
> needs replacing
>  (I've started something ~1 year ago, hopefully I'll
> return to it soon).
> 
> Andrei
> 
> > Samuel.
> > 
> > 2007/1/25, Katty Xiong <cyyxiong at yahoo.com>:
> > >
> > >Hi,
> > >
> > >The current tcp_send() (in tcp_main.c) always
> asks the
> > >main tcp process for the connection fd. Actually,
> the
> > >fd returned by the TCP main process is same as
> the one
> > >pointed by the tcp connection that is already
> known by
> > >the function. So is there corner cases that force
> > >tcp_send to ask the tcp main process for fd
> instead of
> > >using the fd pointed by the tcp connection?
> > >
> > >In stress tests, I notice that the tcp main
> process
> > >actually becomes a bottleneck because it needs to
> > >serve many fd requests from TCP child processes.
> I
> > >believe SER will scales better if tcp child
> processes
> > >doesn't burden the tcp main process with fd
> requests.
> > >
> > >
> > >thanks,
> > >Joy
> > >
> > >
> > >
> >
>
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