Search Again: Theoretical Babble Question.... From: Jerry Pasker-Systems Admin. Date: Wednesday, December 1, 1999 Time: 7:36:00 am After it was collectively pointed out by several list members, (I agreed) that my Performa 6220 was a real 'dog' of a machine, I went kind of overboard, and am now running my primary DNS server on a Lime 333, (currently 32MB) soon to have 160MB of RAM. I went out looking for a utility that I could use to benchmark DNS performance, and I ended up just using the DNS look up in DNS Expert. It of course won't send 'X' number of requests, and summarize the results, but it seems good enough in its millisecond accurate results it gives. My DNS server, connected to a Cisco 2924 switch, running full duplex 100Mb Ethernet, has a latency of 28ms during several queries from a 300Mhz G3 workstation also running 100Mb full duplex. A 350 Mhz (K6-2) Linux (RH 6.something) box running BIND connected to the same switch with 100Mb full duplex ethernet does the same set of look ups in about 31ms. These are numbers that I can definitely live with. (my 6220, under no load, will do the same test with a 57ms latency) I really want to find a utility to send several hundred, or thousand UDP DNS requests per second, and summarize the latency, and % successfully resolved results. Does anyone know of such a utility? I'm assuming there's one available that would run under anyone's flavor of Linux. Of course, such a utility could become a deadly DNS-killing Denial of Service program if used in a malicious manor. Actually, I suppose it should hose any DNS box it's pointed at, if it is to test them correctly. So, what is the theoretical maximum number of UDP DNS requests QuickDNS Pro can do in one second with high-end hardware? What would the latency be? (maybe Sigfus already knows the answer to this one....) -Jerry

Messages In This Thread: Theoretical Babble Question.... by Jerry Pasker-Systems Admin. on Dec 1, 1999 at 7:36:00 am Re: Theoretical Babble Question.... by Sigfus Magnusson on Dec 2, 1999 at 8:58:00 am