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NAT taks some CPU and memory copying, with slower CPU, it will
be slower. It is different from the switch only -- even switch only
has the speed that is slower than wire. We measured top of
line Intel Gigabit switch, the latency is about 8 micro-second without
NAT. We tested the load balancer we build based on Wensong's
kernel code, the latency including the NAT is under 45 micro second
through two 10/100 Ethernet interface cards. CPU usage also has
things to do with how many user daemons do you have and
how much other overhead do you have. With kernel only, there
is really little CPU demand, no matter how much load you have.
The bandwidth is limited by the network interface.
At 11:28 PM 7/18/2001 +0200, you wrote:
>At 23:25 18/07/2001 +0200, you wrote:
>>Hi Suresh,
>>
>>>It seems to me that the real benefit of the Cisco is wire-speed
>>>NAT.
>>
>>Considering the wire-speed, for a standard use (10-20 realservers) it is not
>>really needed if you are using a limited Internet bandwidth (2-5 MBits/s). I
>>agree that ASICs works faster but in most case it is not needed. For example
>>a commercial person (from Alteon) told me : "yes... blablabla, our hardware
>>solution is better because NAT is done directly into silicium..." so I answer
>>him, : "whoooo :) but our corporate Internet Bandwidth is around 4 MBits/s
>>so gigabit interface just to loadbalance a server pool is really not
>>needed..." So in conclusion IMHO wire-speed is much more a commercial
>>argument than technical, sometime it is really need for big ISP/ASP
>>architecture, but most of the time this is only a luxe.
>
>10-20 realservers is not 2-5 Mbits except on luxe configuration
>
>one of my customers use 24 servers with 50 Mbps and 20% cpu usage :)
>
>How much bandwidth is LVS in production area can manage ?
>
>Regards,
>
>
>Arnaud Pignard (apignard@xxxxxxxxxxx)
>Frontier Online - Opérateur Internet
>http://www.frontier.fr
>
>
>
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