Date: Fri, 12 May 2017 23:02:43 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Karl Denninger <karl@denninger.net>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: Possible -HEAD problem with the Pi3 onboard ethernet Message-ID: <e5f9d528-f579-5d63-454a-bd2fc14e7340@selasky.org> In-Reply-To: <ae04f5db-8f58-550b-1fb8-de22433b5319@denninger.net> References: <ae04f5db-8f58-550b-1fb8-de22433b5319@denninger.net>
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On 05/12/17 19:45, Karl Denninger wrote: > Under fairly heavy stress (~50% of the 100Mbps possible FDX performance) > I've now run into a problem that is turning into something I can repeat > without too much trouble by transmitting a large file through the device. > > The system appears to "crash" from the outside. It's not dead, however > -- it's got some sort of network buffer hang going on. This is a Pi3 > with current (-HEAD, FreeBSD 12.0-CURRENT #0 r318193M: Thu May 11 > 16:18:20 CDT 2017) software on it -- reverting to a mid-March kernel did > NOT change the behavior. > > The symptomology is that the unit will start printing this on the console: > > May 12 12:25:46 IPGw dhcpd: send_packet: No buffer space available > May 12 12:25:46 IPGw dhcpd: dhcp.c:3974: Failed to send 300 byte long > packet over ue0.3 interface. > > ue0.3 is a VLAN for a private subnet and is not specific to the issue; > it also complains about no space on the primary too: > > May 12 12:27:06 IPGw dhcpd: dhcp.c:3974: Failed to send 300 byte long > packet over ue0 interface. > May 12 12:27:13 IPGw dhcpd: send_packet: No buffer space available > > netstat -m does /not /show any denied or delayed requests for network > buffers or mbuf exhaustion. Systat -vm shows plenty of RAM available > (roughly half.) > > An ifconfig ue0 down / ifconfig ue0 up sequence from the console clears > the hang. > > Has anyone else seen anything similar to this? > Hi, It might be a bug in the USB network driver for the RPI. You can try to run usbdump on ugenX.Y for the network interface. usbdump -i usbusX -f Y And see what is going on. --HPS
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