[ntp:questions] Recommendations for good NIC cards

unruh unruh at wormhole.physics.ubc.ca
Sat Apr 17 19:16:09 UTC 2010

On 2010-04-17, Uwe Klein <uwe_klein_habertwedt at t-online.de> wrote:
> unruh wrote:
>> On 2010-04-15, Russell, David <David.Russell at 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* ????????????? )

How do you configure it on Linux?

> 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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