On 2007/05/31 12:18, [EMAIL PROTECTED] wrote: > Anyone know the maximum packets per second that can traverse a 100MB > internet link. From what I've been able to gather its about 8300 or so?
100Mb -> somewhere between that and about 220,000. depends on packet size. you're probably more interested in how many pps the devices *either side of that link* can handle, though. you'll have to find this out for yourself. if I run a packet generator on box 1 (amd64 MP/sk) sending small UDP packets towards box 2 (i386 MP/bge) with just a switch between them (all gigabit), I see this rate of bytes/sec and pps: (this is all pre-hackathon kernels) Iface State Ibytes Ipkts Ierrs Obytes Opkts Oerrs Colls sk0 up:U 7000 100 0 18364134 322176 0 0 -> in Mbit/s: <[EMAIL PROTECTED]:12103>$ echo $((18364134*8/1024)) 143469 and all is reasonably ok, things are not too bad on either system. plenty of cpu is in use but things mostly still work ok. > Do connections just start to timeout once I hit this limit? depends on all sorts of things. NIC type, packet sizes, what kernel you're using (i386/amd64/UP/MP), PF on or off, how applications handle that kind of traffic if they're involved rather than just routing or bridging ... but 8k pps is not really very much for a system to handle. with the above example: if I reverse things and send from box 2 to box 1, box 1 grinds to a standstill, it doesn't respond to anything typed at the console until the packet flow ceases since all time is processing interrupts. and that's at just 150kpps or so which is all that box2 manages to send. (i386 MP kernel/bge) > I'm a little worried about this because we are fast approaching this > mark and am afraid were gonna hit it before we max out are available > bandwidth? Anyone ever run into this situation or am I just paranoid? generate some load, do some testing, and see what happens. you are probably worrying too much at 8kpps if the pipe is not nearly near full.
