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Re: Re: Re: [lwip-users] will lwip support asyncselect justlikeWSAAsyncS
Re: Re: Re: [lwip-users] will lwip support asyncselect justlikeWSAAsyncSelect
Thu, 7 Apr 2011 09:14:15 +0800
Thanks for your reply!
>I'm assuming this is a nonblocking connect?
> select(65,readset, writeset,errset, 0);
> if (FD_ISSET(clientsocket[i].socket, writeset))
> if (FD_ISSET(clientsocket[i].socket, readset))
> When TCP_CLIENT_LINK_TOTALS is equal 16,it works well.But when it is
> equal 64,it will cost more than 100 ms for a socktet to receiver something.
>I wouldn't have thought that the select implementation is the limiting factor
>here. Are you sure you did not run >into memory limitations somewhere?
>Specifically, you need to set MEMP_NUM_NETCONN high enough as well as >have
>enough pbufs, heap memory and tcp segments. Did you check the stats that there
>is no error (all 'err' >members should be 0)?
>While our select implementation might be somewhat suboptimal, 64 sockets
>should not be a problem at all. I'll >see if I can write a test for this.
I also have done some tests for this issue. I edite the "charge" programe so
that it can echo the request of the modbuspoll.the lengthe of the request
packet data is 12 Bytes,and the one of the echo's is 250 Bytes.I use the
wireshark to capture the traffics.there is the result.
If there are 64 active connetions and only 1 connetion has traffics,the ack
time is among 1~54 ms,and the usual valuse is 2 ms.
If send a arp begin the first "for" cycle,and observe the time between two
arp packets,the the time is among 1~154ms.
In fact,it is ok if everything is done in my own modbuspoll program and the
throught may achieve 2000pps.But the actual application is that a 10ms thread
decide what to send and to see if have something received and other correlative
process. So,in some case,my modbuspoll will send 64 packets first,then do the
receive in the next "select". As the result it is maybe too inefficient.
It must be difficult to understand my application,maybe you can see the program
for example? Thanks very much.
The file "tcpclient.c" is my test program.the 10ms thread is just like the
function below,of courese more complex .
void TaskRun(void *pData)
U8 byErr = 0;
U8 i = 0;
pMsg = (U32*) OSQPend(AppArray, 0, &err);//every 10ms
sendflag[i] = 1;
recvflag[i] = 0;
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