[Beowulf] Performance tuning for Jumbo Frames

Scott Atchley atchley at myri.com
Tue Dec 15 12:49:23 EST 2009


On Dec 14, 2009, at 12:57 PM, Alex Chekholko wrote:

> Set it as high as you can; there is no downside except ensuring all
> your devices are set to handle that large unit size.  Typically, if  
> the
> device doesn't support jumbo frames, it just drops the jumbo frames
> silently, which can result in odd intermittent problems.

You can test it by using the size parameter with ping:

$ ping -s <size_in_bytes> <host>

If they all drop, then you have exceeded the MTU of some device.

Scott
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