fascinating stuff. On Apr 5, 2013 6:06 PM, "Richard Fuchs" <rfu...@sipwise.com> wrote:
> On 04/05/13 03:53, Daniel-Constantin Mierla wrote: > > > She fallback to user space can happen even during a call? Or is just > > about when the call is initialized, the application detects is some > > problem when setting up forwarding rules in the kernel and goes for user > > space. > > It can happen any time. The socket remains open and the daemon continues > to listen for packets on it. If the daemon receives a packet, it will > process it, which in the normal case will result in it being forwarded. > With the kernel module active and working, the daemon will simply not > see the packets coming in on the socket. > > > Indeed, this is kind of general feeling, at least based on theoretical > > aspects, but I haven't seen any kind of numbers just to compare and see > > how much is worth to go for kernel forwarding. > > I did a very simple test, one pseudo-call (one port in, one port out) > with about 35,000 UDP packets per second going each way. Each packet had > 150 bytes payload and the test was done on an 8-core Xeon 2.53 GHz > machine running kernel 2.6.32. Under this workload, the daemon registers > with about 90% single-CPU load without kernel forwarding. The daemon is > multi-threaded and so can use multiple cores, but if it weren't, then it > would be about maxed out at this point. Averaged over the 8 cores this > leaves the system around 88% idle. With kernel forwarding enabled, > system CPU usage drops to >99% idle. > > cheers > > > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > sr-users@lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > >
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