See I/OAT description here.
Solaris (at least snv_93 and and snv_95) panics if large amount of traffic is sent across the interface dedicated to a zone with exclusive TCP/IP stack. For example, start Firefox and forward the X traffic to the global zone.
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Intel® I/O Acceleration Technology (Intel® I/OAT) accelerates TCP/IP processing and reduces CPU overhead. It scales up to eight GbE and 10 10GbE ports and supported on dual- or quad-core Xeon architecture.
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