[Beowulf] Performance tuning for Jumbo Frames

Rahul Nabar rpnabar at gmail.com
Wed Dec 16 11:02:29 EST 2009


On Tue, Dec 15, 2009 at 10:41 PM, Patrick Geoffray <patrick at myri.com> wrote:
> Bogdan Costescu wrote:

> So, instead of requiring ~4K per port minimum, you need about ~20K per port.
> Add to that up to 8 priorities with DCB and the buffering requirement are
> quickly getting out of hand. That's one big drawbacks of large MTUs, along
> with contention with wormhole switching.


On closer investigation I am seeing TXPause frames and dropped
packets. Have to dig deeper into this.Gotta figure  out how much RAM
per port this switch has.

-- 
Rahul
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