On Sun, 22 Aug 2004 23:55:29 +0530, Anantha Kiran <ananth.kandukuri@xxxxxxxxx> wrote: > No, we are not using NAPI for this. But we wrote a net_hook module > which catches the pkts before allowing it to go upper layers. > > CPU utilization is 70+ while dropping. > > Can u tell me the configuration of your low-end machine.Like PCI-bus, > and others. > Ours are Intel(R) Xeon(TM) CPU 2.40GHz and the motherboard has a PCI-X chipset on it. We have one Intel fibre optic Gig-E on the 02:01 PCI-X Bus, and the other on the 03:01 PCI-X bus. I see a limit of about 750 mbits/sec on a fixed load (HTTP accesses for specific boxes), and 400 mbits/sec on a mixed load (ICMP/UDP/TCP). In each case, the maximum looks to not be the bus speed as much as the soft-irq limit (which is what mpstat says is using all the resources). The number of packets per second that ifconfig and other tools gives me looks about the same. so I am thinking it isnt bus width at the moment as much as IRQ/packets per second. The kernels are NAPI compiled.. but I really havent figure out if using netfilters on these mixed loads 'disables' it. -- Stephen J Smoogen. Professional System Administrator - : send the line "unsubscribe linux-admin" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
