[Beowulf] Performance tuning for Jumbo Frames

Greg Lindahl lindahl at pbm.com
Tue Dec 15 16:22:56 EST 2009


On Tue, Dec 15, 2009 at 12:49:23PM -0500, Scott Atchley wrote:

> 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.

[lindahl at greg-desk b]$ ping -s 60000 rich-desk
PING rich-desk (64.13.159.69) 60000(60028) bytes of data.
60008 bytes from rich-desk (64.13.159.69): icmp_seq=1 ttl=64 time=1.36 ms
60008 bytes from rich-desk (64.13.159.69): icmp_seq=2 ttl=64 time=1.32 ms

I never knew I bought such advanced network gear!

-- greg


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