Are you running out of ephemeral ports? See net.inet.ip.portrange sysctl or do your own port management.
Alex. On Tue, 9 Oct 2001, Nguyen-Tuong Long Le wrote: > Hi all, > > I have a software that simulates web clients and servers to create > network congestion (for the purpose of doing research in network > congestion). In our experiment, a client opens an HTTP connection > to a server, fetches a number of objects, and then closes the > connection. A problem I seem to have right now is that a client > machine cannot simulate more than 3000 connections. When my client > machine simulates more than 3000 connections, it's able to open > a socket but then connect(2) fails with errno 35 (Resource > temporarily unavailable). Another interesting notice is that the > connect(2) system call blocks for a few miliseconds before it > fails although fcntl(2) was used to make the socket non-blocking. > The OS version I am using is FreeBSD 4.3-release. > > I used sysctl to bump up kern.maxfiles and kern.maxfilesperproc to > 16384. I also bumped up kern.ipc.somaxconn to 8192 on the server > side. I recompiled the kernel with option NMBCLUSTERS=65536 to > increase the number of mbufs. I guess that CPU is not the bottleneck > since I have the same problem regardless whether I use a 300 MHz or > a 1 GHz machine. > > Does anyone have any suggestion what kind of resources my client machine > runs out and how I can fix it? > > Thanks, > Long > > P.S. Please kindly email your reply to me since I am not on the list. > > > To Unsubscribe: send mail to [EMAIL PROTECTED] > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-net" in the body of the message
