On Tue, 2005-12-06 at 23:19 -0500, Jan Wieck wrote: > It's not so much the bandwidth but more the roundtrips that limit your > maximum transaction throughput.
I completely agree that the latency is counting, not the bandwith. Does anybody have latency / roundtrip measurements for current hardware? I'm interested in: 1Gb Ethernet, 10 Gb Ethernet, InfiniBand, probably even p2p usb2 or firewire links? At least Quadrics claims(1) to have measured only 1.38 microseconds. Assuming real world condition would give you 5 microseconds, on a 3 GHz processor that's 15'000 CPY cycles. Which is IMHO not that much any more. Or am I wrong (mental arithmetic never was my favourite subject)? Regards Markus [1] http://www.quadrics.com/quadrics/QuadricsHome.nsf/NewsByDate/98FFE60F799AC95180256FEA002A6D9D ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org