https://community.intel.com/t5/Intel-MPI-Library/IMB-2-3-Alltoall-causing-packet-drops-on-SE7230NH1-82573V/m-p/919984#M2352 I am running into an issue running the IMB benchmark (v2.3), specifically the Alltoall test. When the MPI message size increases above 4096 the nodes start to drop packets.<BR /><BR /><BR /><BR />I am using:<BR /><BR /><BR /><BR />2.6.16.11<BR /><BR />e1000 driver ver 7.0.41<BR /><BR />IMB ver 2.3<BR /><BR /><BR /><BR />The benchmark is being run on six dual core nodes. The mpirun commandline reads:<BR /><BR /><BR /><BR />/opt/src/wsm/mpich/mpich-1.2.7p1/bin/mpirun -v -nolocal -np 12 -machinefile /opt/mpich/gnu/share/machines /home/wsm/mpich-wsm/IMB_2.3/src/IMB-MPI1 Alltoall -npmin 12<BR /><BR /><BR /><BR />I have outfitted two of the nodes with Pro/1000-PT (82572GI) PCIe adapter cards and those nodes no longer have any dropped packets even when Alltoall msgsize increments all the way to 4MB.<BR /><BR /><BR /><BR />I have raised this issue via Intel quad support as a hardware issue but I wanted post this in the HPC group in case there was different insight. Thu, 22 Jun 2006 00:34:45 GMT Deleted_U_Intel 2006-06-22T00:34:45Z https://community.intel.com/t5/Intel-MPI-Library/IMB-2-3-Alltoall-causing-packet-drops-on-SE7230NH1-82573V/m-p/919984#M2352 I am running into an issue running the IMB benchmark (v2.3), specifically the Alltoall test. When the MPI message size increases above 4096 the nodes start to drop packets.<BR /><BR /><BR /><BR />I am using:<BR /><BR /><BR /><BR />2.6.16.11<BR /><BR />e1000 driver ver 7.0.41<BR /><BR />IMB ver 2.3<BR /><BR /><BR /><BR />The benchmark is being run on six dual core nodes. The mpirun commandline reads:<BR /><BR /><BR /><BR />/opt/src/wsm/mpich/mpich-1.2.7p1/bin/mpirun -v -nolocal -np 12 -machinefile /opt/mpich/gnu/share/machines /home/wsm/mpich-wsm/IMB_2.3/src/IMB-MPI1 Alltoall -npmin 12<BR /><BR /><BR /><BR />I have outfitted two of the nodes with Pro/1000-PT (82572GI) PCIe adapter cards and those nodes no longer have any dropped packets even when Alltoall msgsize increments all the way to 4MB.<BR /><BR /><BR /><BR />I have raised this issue via Intel quad support as a hardware issue but I wanted post this in the HPC group in case there was different insight. Thu, 22 Jun 2006 00:34:45 GMT https://community.intel.com/t5/Intel-MPI-Library/IMB-2-3-Alltoall-causing-packet-drops-on-SE7230NH1-82573V/m-p/919984#M2352 Deleted_U_Intel 2006-06-22T00:34:45Z