On Fri, Aug 10, 2007 at 09:00:41AM -0400, Tim Shoppa wrote: || Zweije writes: || > I've been rotated in several times and I have observed the || > onslaught of ttnet on my time server. The load at such times || > is around 100 queries per second according to ntpdc -n -c monlist || > <http://www.zweije.nl.eu.org/ntp/>, with around 60-80 of them from ttnet. || > Despite only having 500kbit upstream, I observed no problems. And I || > shouldn't, because it's only 10% of the bandwidth. || || Silly question from someone in the US who has not || personally observed the TTN load: || || Is that 100 queries per second for a whole hour or is it bursty || in some other pattern?
The burst load is about 100 queries each second. The regular load is 3-5 queries each second. About 80 queries per second is caused by clients with an update interval of 1 second, IIRC (I'm writing this from memory). The remainder is from more than 20 clients with intervals of more than 1 second. Consequently, if you could drop these 80 queries per second, the load would drop to 20 queries per second. I'm not absolutely sure whether ttnet cause a large fraction of those 1-second-interval queries, but I am sure they represent a major number of the clients. || Is it 100 clients hitting once a second, or is it 1000000 || clients each hitting every 1024 seconds, or something || in between? It's something in between. A few clients cause most of the queries. Check the URL above. On Fri, Aug 10, 2007 at 03:12:05PM +0200, Maurice Janssen wrote: || On Friday, August 10, 2007 at 09:00:41 -0400, Tim Shoppa wrote: || >Zweije writes: || >> Now my ADSL set is setup in that it has no router [...] || >> There is no address translation || > || >I think the specific thing here is not whether it's a router or not, || >or whether the modem is internal or not, but address translation || >being turned on. Because address translation uses limited memory to store state, and breaks when memory is exhausted. || Agreed. I have an external ADSL modem + router, no NAT and haven't had || any problems with the spikes. They typically use about 50 kbit/s of || bandwidth, which isn't that much. Exactly. And that 50 kbit/second agrees very nicely with 100 queries per second, at ~50 bytes = ~500 bits per query. Ciao. Vincent. -- Vincent Zweije <[EMAIL PROTECTED]> | "If you're flamed in a group you <http://www.xs4all.nl/~zweije/> | don't read, does anybody get burnt?" [Xhost should be taken out and shot] | -- Paul Tomblin on a.s.r.
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