On Thu, Feb 07, 2002 at 11:55:31PM +0100, Ralf Habacker wrote: > One question: Does unix domain sockets uses localhost address ? >net.cc:cygwin_socketpair() seems to use first an ip > adress of zero and later the loopback address. Could this have an effect ?
Nope. It's probably more secure to use INADDR_LOOPBACK here but it has nothing to do with speed. > I have tried to replace the locations using INADDR_ANY with htonl (INADDR_LOOPBACK) >but recognized no changes. I would have lost a bet if that had changed anything. > If you look a little deeper you can see, that the read() in unix domain socket >benchmark returns only 32708 bytes > > 1966 1981317 [main] bw_unix 1788 _read: 32708 = read (3, 0xA012048, 65536), errno 0 > > while the read() in the tcp benchmark returns 65416 > > 2573 7229513 [main] bw_tcp 1792 _read: 65416 = read (3, 0xA012048, 65536), errno 0 > > and thats may be a reason for the performance difference. Hmm, perhaps. I've just checked in a fix which perhaps changes that disproportion. Could you please check with the latest from CVS aggain? > The main difference between the two benchmarks are the used device /dev/sockstream >against /dev/tcp. > But don't ask me about the reason why, now I'm left That's easily to see in the sources. net.cc? > returned stable after a few (about 10) returns with the full buffer size of 65536 in >the main benchmark loop. Could > this be a bug in the winsock code or is it be caused by timing differences, because >not all data is send early > enough ? (There are 119 bytes missed) Dunno. Winsock overhead, perhaps. > BTW2: > > I'm a bit surprised by your results, though. > I'm additional surprised that the native unix domain sockets performance under >cygwiwn is only 7% of the linux > performance with the same hardware, while the tcp performance seems to be acceptable >(64% of the linux > performance). So my main target is to speed this up. :-) That's not a surprise. AF_LOCAL sockets are naturally equaly slow or slower than AF_INET sockets on Cygwin (why? Exercise for the reader!) while they are a completely independent implementation on Linux or other OSes. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Developer mailto:[EMAIL PROTECTED] Red Hat, Inc. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
