unruh wrote:
On 2010-04-15, Russell, David <david.russ...@dowjones.com> wrote:
I have seen several comments saying that the NIC card in an NTP client can make
a difference in how well NTP will perform.
My servers are Dells running RedHat.
Does anyone have any recommendations for a particularly good NIC card for
Gigabit speeds? I am also interested in knowing if there are any known
clunkers.
I suspect GB cards are worse than 100MB cards in the latency department.
I have had a number which produced much worse results for ntp ( some
sort of store and hold in the cards).
You certainly do not need GB speeds for ntp.
The core difference may well lie in multiple packets received per interrupt (
or not )
which is comfigurable ( on linux, bsd?, win* ????????????? )
As most other brand new problems it is a performance / (unpredictable) latency
tradeoff:
http://www.google.com/search?q=Interrupt+coalescing
uwe
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