Am 09.03.2009 19:08 Uhr, schrieb Ask Bjørn Hansen:
I never bothered to really setup counting of requests. A very quick and dirty count:On Mar 4, 2009, at 13:02, Arnold Schekkerman wrote:This particular box is in the US and is set to 50Mbps on http://www.pool.ntp.org/manage/servers -- so it seems to get about 1 query per second "per megabit". Does that correspond with what others are seeing?My box in NL, EU is set to 1Mbps and got 685K [1] requests over the past 15.25 days (iptables ntp match count). That makes 0.5qps/Mbit average.Any other anecdotal numbers here? In particular I'd be curious about the query rates for hosts set to 100 or 1000Mbit. The aggregate "available mbit" is about 156Gbit, so with 0.5qps/mbit we're doing about 80k requests a second (or about 7 billion a day). For comparison, I've been told the NIST servers do 30k a second; so even if our average really is 0.25qps/mbit then we're definitely helping. :-)
time1.uni-paderborn.de: r...@isis[~]# time tcpdump -i eth0 port ntp -n >/dev/null tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 171076 packets captured 171080 packets received by filter 0 packets dropped by kernel real 11m21.161s user 0m0.948s sys 0m0.252s which is 251 queries per second or 0.251 per MBit time2.uni-paderborn.de: r...@re[~]# time tcpdump -i eth0 port ntp -n >/dev/null tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 161534 packets captured 161536 packets received by filter 0 packets dropped by kernel real 10m47.408s user 0m0.760s sys 0m0.244s Even a bit lower but still similiar.If someone is interested and has some pointers I can do a long term mesaruement.
Arne
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