Re: Paper on device polling and packet capture performance

2004-01-11 Thread Petri Helenius
Bruce M Simpson wrote: I'd be happy to review other patches for this. My personal feeling though is that the actual performance increase may not be that great, but it's a case of someone implementing it and doing the math. Writing to memory, specially on SMP systems, is very expensive. So eli

Re: Paper on device polling and packet capture performance

2004-01-11 Thread Don Lewis
On 11 Jan, Bruce M Simpson wrote: > On Fri, Jan 09, 2004 at 03:51:43PM -0600, Guy Helmer wrote: >> I want to look at memory-mapped access to the BPF device. >> This would preserve the existing network device drivers >> while reducing mbuf copies, context switches/user-kernel >> transitions, and lat

Re: Paper on device polling and packet capture performance

2004-01-11 Thread Bruce M Simpson
On Fri, Jan 09, 2004 at 03:51:43PM -0600, Guy Helmer wrote: > I want to look at memory-mapped access to the BPF device. > This would preserve the existing network device drivers > while reducing mbuf copies, context switches/user-kernel > transitions, and latency. Performance ought to be > compara

RE: Paper on device polling and packet capture performance

2004-01-09 Thread Guy Helmer
Richard Bejtlich wrote on January 09, 2004 11:17 AM > I was wondering if anyone read the paper by Luca Deri > (of Ntop fame) on "Improving Passive Packet Capture: > Beyond Device Polling": > > http://luca.ntop.org/Ring.pdf > > Luca makes some astounding claims regarding packet > capture performa