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User-Agent: Mozilla/5.0 (Windows U Windows NT 5.1 de PMsg = (U32*) OSQPend(AppArray, 0, &err) //every 10msįrom: "Thomas Richter (TCD - DE/Dresden)" The file "tcpclient.c" is my test program.the 10ms thread is just like the function below,of courese more complex. It must be difficult to understand my application,maybe you can see the program for example? Thanks very much. As the result it is maybe too inefficient. So,in some case,my modbuspoll will send 64 packets first,then do the receive in the next "select". 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. If send a arp begin the first "for" cycle,and observe the time between two arp packets,the the time is among 1~154ms. 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. 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. I also have done some tests for this issue.
I'll >see if I can write a test for this. >While our select implementation might be somewhat suboptimal, 64 sockets should not be a problem at all. Did you check the stats that there is no error (all 'err' >members should be 0)? 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. >I wouldn't have thought that the select implementation is the limiting factor here. > equal 64,it will cost more than 100 ms for a socktet to receiver something. > When TCP_CLIENT_LINK_TOTALS is equal 16,it works well.But when it is > if (FD_ISSET(clientsocket.socket, readset)) > if (FD_ISSET(clientsocket.socket, writeset)) > select(65,readset, writeset,errset, 0) >I'm assuming this is a nonblocking connect? This is a multi-part message in MIME format. X-detected-operating-system: by : GNU/Linux 2.6 (newer, 3) Subject: =?utf-8?B?UmU6IFJlOiBSZTogW2x3aXAtdXNlcnNdIHdpbGwgbHdpcCBzdXBwb3J0IGFzeW5jc2VsZWN0IGp1c3RsaWtlV1NBQXN5bmNTZWxlY3Q=?=īoundary="=001_Dragon587824623245_=" To: "=?utf-8?B?TWFpbGluZyBsaXN0IGZvciBsd0lQIHVzZXJz?=" Received: from chenyintao0 (unknown )īy (SupMail(Postfix)) with ESMTPA id 3B5C241846E Received: from ()īy localhost ( ) (amavisd-new, port 10024)
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