Hello, I am trying to test the capacity of a linux PPTP server, both in number of connections, and in packets per second. I am using kernel 2.6.38.8, with the ppp, pptp, and gre modules, and accel-pptp 0.8.3. I have RPS, RFS, and XPS enabled on the network devices for SMP support. But I'm seeing one CPU get pegged out with soft interrupt, while the others are almost completely idle. In my current test, I'm starting 250 pptp connections from another server, then running iperf across each connection. The client machine pegs out, sure, but I'm surprised the server pegs out a single CPU. With RPS, I would expect softirq's to be more balanced. Where could the bottleneck be? Do all ppp packets need to be processed serially? Brad -- To unsubscribe from this list: send the line "unsubscribe linux-ppp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
