Rick Jones wrote: >> A lot of people tend to forget that the pci-express bus has enough >> bandwidth on >> first glance - 2.5gbit/sec for 1gbit of traffix, but apart from data >> going over it >> there is significant overhead going on: each packet requires transmit, >> cleanup and >> buffer transactions, and there are many irq register clears per second >> (slow >> ioread/writes). The transactions double for TCP ack processing, and >> this all >> accumulates and starts to introduce latency, higher cpu utilization >> etc... > > Sounds like tools to show PCI* bus utilization would be helpful...
that would be a hardware profiling thing and highly dependent on the part sticking out of the slot, vendor bus implementation etc... Perhaps Intel has some tools for this already but I personally do not know of any :/ Auke -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
