[Beowulf] Performance tuning for Jumbo Frames

Rahul Nabar rpnabar at gmail.com
Tue Dec 15 14:24:27 EST 2009


On Tue, Dec 15, 2009 at 11:49 AM, Scott Atchley <atchley at myri.com> wrote:
> 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.

Thanks Scott. 9000 seems the max. Neither my Switch  nor my eth
adapter like higher values.

-- 
Rahul

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