On Dec 2, 2010, at 11:47 AM, miguelmedalha@xxxxxxx wrote:
>
>> For completeness (since many previous posts have touched on this), we don't
>> use jumbo frames since we have no problem reaching wirespeed with normal 1500
>> frames.
>>
>
> Jumbo frames have advantages other than "reaching wirespeed". Its use
> produces less overhead and in general less CPU utilization.
> Your network will see less trafic and your CPUs will be free to do other work.
True, like always it depends on your CPU and your network application's sensitivity to latency.
Jumbo frames equals less CPU but more network latency, more network latency equals less achievable throughput.
You don't need jumbo with 1Gbe and a current CPU, but for 10Gbe, jumbo frames are recommended, unless you can dedicate a core per 10Gbe NIC.
-Ross
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