Jason Coleman's script to turn off iovDisableIR per http://www.oshelp.co.uk/?p=96

iovDisableIR-disable.ps1

$allHosts = get-folder unconfigured | get-vmhost | sort name
foreach ($thisHost in $allHosts){
    $esxcli = get-esxcli -VMHost $thisHost -v2
    if (($esxcli.system.settings.kernel.list.invoke() | ? {$_.name -like 'iovDisableIR'}).Configured -eq "TRUE"){
        write-host "Working on $($thisHost.name)..."
        $arguments = $esxcli.system.settings.kernel.set.CreateArgs()
        $arguments.setting = "iovDisableIR"
        $arguments.value = "FALSE"
        $esxcli.system.settings.kernel.set.Invoke($arguments)
    }
}
write-host "Please reboot $($allHosts.name -join(', '))"