On Wed, 2013-05-29 at 17:14 +0300, Or Gerlitz wrote: > On Wed, May 29, 2013 at 9:39 AM, Eliezer Tamir > <eliezer.ta...@linux.intel.com> wrote: > > Adds a new ndo_ll_poll method and the code that supports and uses it. > > This method can be used by low latency applications to busy poll Ethernet > > device queues directly from the socket code. The value of sysctl_net_ll_poll > > controls how many microseconds to poll. Set to zero to disable. > > Unlike with TCP sockets, UDP sockets may receive packets from multiple > sources and hence the receiving context may be steered to be executed > on different cores through RSS or other Flow-Steering HW mechanisms > which could mean different napi contexts for the same socket, is that > a problem here? what's the severity?
Maybe ARFS could be extended so the driver can tell whether a UDP socket it's steering for is connected or not. Then for disconnected sockets the driver can use a filter that only matches destination address. (Though that's probably undesirable if the socket has SO_REUSEPORT set.) Ben. -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
