On Tue, 17 Jul 2007 10:23:30 -0700 "Kok, Auke" <auke-jan.h.kok@xxxxxxxxx> wrote: > M. Koehrer wrote: > > Hi everybody, > > > > I have a question concerning Ingo Molnar's realtime preempt patch. > > This patch is great go get low latency on timer threads and a really > > good real time behaviour. > > I want to connect an external, embedded device via Ethernet (UDP/IP) > > to my Linux PC. This communication should be in real time as well. > > For this I have a separate network adapter in my PC that is used > > solely for this UDP Ethernet traffic. > > However, I think all Ethernet traffic is be handled by > > the soft IRQ threads [softirq-net-rx] [softirq-net-tx] but I do > > not see a way to do real time networking via one of the network adapters. > > > > How can I get this UDP networking real time capable? > > In general, you'll have to find a non-NAPI ethernet driver and disable any form > of interrupt throttling. This will likely adversely affect throughput of course... > RT kernel will also change the adapter hard irq into a work queue so it will actually make the receive latency worse not better. - To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
