Hi Folks, I'm attempting to use netconsole to get a look at boot time kernel messages from a headless system. The goal is to get a look at things that happen before the system is up enough to successfully log these messages to its local log files. The behaviour I'm seeing is that about 12 seconds of messages are lost, *after* netconsole is successfully enabled. Other messages arrive normally. The NIC driver appears to be sending the missing messages, but they aren't making it to neighbouring systems... probably not making it to the wire at all, but I can't quite prove that. I have built netconsole and my nic driver (igb) into the kernel, rather than leaving them as loadable modules. I'm passing the netconsole parameters to the kernel on its command line. Netconsole is initializing before the system would otherwise get around to setting its IP address, so I'm supplying that address as part of the netconsole parameters. I'm passing "debug" on the kernel command line to make sure that everything in dmesg _should_ have been sent to all consoles, including netconsole. I've looked at the network traffic with wireshark as well as with the normal receiver (netcat), and checked for anything coming from the relevant MAC address. I've instrumented the NIC driver, and counted calls to the xmit routine, along with error paths; the number of calls match the number of printks, and the error paths I instrumented are not being taken. I'm fresh out of ideas ;-) Any suggestions for where to dig would be appreciated. ARCH linux. Kernel 3.13 with a few patches. x86_64. -----cut n paste from dmesg output, around the point when data gets out--- [ 6.292772] input: HID 0557:2419 as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3.1/1-1.3.1:1.1/input/input5 [ 6.293024] hid-generic 0003:0557:2419.0004: input,hidraw3: USB HID v1.00 Mouse\ [HID 0557:2419] on usb-0000:00:1a.0-1.3.1/input1 [ 7.064376] mpt2sas0: host_add: handle(0x0001), sas_addr(0x5003048011879600), phys(8) ****above gets lost; below really gets onto the wire*** [ 12.196218] mpt2sas0: port enable: SUCCESS [ 12.198261] scsi 0:0:0:0: Direct-Access ATA ST4000DM000-1F21 CC52 PQ: 0 ANSI: 6 [ 12.198400] scsi 0:0:0:0: SATA: handle(0x000b), sas_addr(0x4433221102000000), phy(2), device_name(0x5000c5006d273da6) [ 12.198527] scsi 0:0:0:0: SATA: enclosure_logical_id(0x5003048011879600), slot(1) [ 12.198800] scsi 0:0:0:0: atapi(n), ncq(y), asyn_notify(n), Thanks for any ideas. I'm feeling like a complete idiot. Or maybe just someone who really doesn't like dealing with drivers ;-) -- Arlie (Arlie Stephens arlie@worldash.org)