I'm seeing a serious latency problem with igb interfaces under OpenSolaris. I have several test boxes that display the bad behaviour. I see ping responses like the the following, averaged over several thousand pings with obvious outliers discarded:
X4170 S10u7/igb -> X4170 snv_111b/igb avg 145us X4170 snv_111b/igb -> X4170 S10u7/igb avg 190us X4170 snv_111b/igb -> X4150 S10u4/e1000g avg 230us X4170 S10u7/igb -> X4150 snv_111b/e1000g avg 117us X4150 S10u4/e1000g -> X4150 S10u4/e1000g avg 169us X4150 snv_111b/e1000g -> X4150 snv_111b/e1000g avg 168us The first pair of results is from a pair of X4170s, looking in each direction. All of the results are from pairs of boxes that are on the same subnet and switch. It seems to be that whenever the OpenSolaris igb driver sends a ping, the latency will be higher than in any other configuration. Has anyone seen this kind of behaviour before? No tuning has been done to these systems -- is there something that is missing from the default configuration of OpenSolaris for the igb driver? Or am I missing something? Thanks, Adrian
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