<br><br><div class="gmail_quote">2009/1/24 Gerry Creager <span dir="ltr"><<a href="mailto:gerry.creager@tamu.edu">gerry.creager@tamu.edu</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Couple of follow-up notes.<br>
<br>
MTU=4500: Had one node fall over with the same overflow errors.<br>
MTU=3000: A WRF model is running, but single timesteps are executing 2.5x slower than MTU=1500<br>
<br>
</blockquote><div><br>Are you using openmpi? Some openmpi versions always enable the naggle algorithm:<br><a href="http://www.open-mpi.org/community/lists/users/2007/07/3752.php">http://www.open-mpi.org/community/lists/users/2007/07/3752.php</a><br>
<br>Perhaps tunning openmpi buffer parameters could help with performance.<br><br></div></div>