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Hi, try with more recent version of accel-ppp (1.5 is lastest) and newer kernel - there are several critical bugs in older kernels P.S the project accel-pptp has changed its name to accel-ppp cheers On Fri, Jan 20, 2012 at 12:35 AM, Bradley Peterson <despite@xxxxxxxxx> wrote: > 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 netdev" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- 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