On Mon, Nov 21, 2011 at 07:32:03AM +0100, Eric Dumazet wrote: > Le dimanche 20 novembre 2011 à 23:16 -0600, Albert Chin a écrit : > > I'm running Ubuntu 11.10 on an Intel SR2625URLXR system with an Intel > > S5520UR motherboard and an internal Intel E1G44HT (I340-T4) Quad Port > > Server Adapter. I am seeing dropped packets on a bonded interface, > > comprised of two GigE ports on the Intel E1G44HT Quad Port Server > > Adapter. The following kernels exhibit this problem: > > 3.0.0-12-server, 3.0.0-13-server, 3.1.0-2-server, 3.2.0-rc2 > > Installing Fedora 16 with a 3.1.1-1.fc16.x86_64 also showed dropped > > packets. > > > > I also tried RHEL6 with a 2.6.32-131.17.1.el6.x86_64 kernel and didn't > > see any dropped packets. Testing an older 2.6.32-28.55-generic Ubuntu > > kernel also didn't show any dropped packets. > > > > So, with 2.6, I don't see dropped packets, but everything including > > 3.0 and after show dropped packets. > > > > # ifconfig bond0 > > bond0 Link encap:Ethernet HWaddr 00:1b:21:d3:f6:0a > > inet6 addr: fe80::21b:21ff:fed3:f60a/64 Scope:Link > > UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 > > RX packets:225 errors:0 dropped:186 overruns:0 frame:0 > > TX packets:231 errors:0 dropped:0 overruns:0 carrier:0 > > collisions:0 txqueuelen:0 > > RX bytes:25450 (25.4 KB) TX bytes:28368 (28.3 KB) > > > > [[ snip snip ]] > > Old kernels were dropping some packets (unknown protocols...) without > counting them. > > So following patch was added in 2.6.37 : > > You could use tcdpump to identify what are these dropped packets :) So only "unknown" protocols are dropped? I just ran tcpdump for 96 packets and inspected the output. The only packets received are LACP, ARP, STP (Spanning Tree Protocol), DTP (Dynamic Trunking Protocol). How are these "unknown"? > commit caf586e5f23cebb2a68cbaf288d59dbbf2d74052 > Author: Eric Dumazet <eric.dumazet@xxxxxxxxx> > Date: Thu Sep 30 21:06:55 2010 +0000 > > net: add a core netdev->rx_dropped counter > > In various situations, a device provides a packet to our stack and we > drop it before it enters protocol stack : > - softnet backlog full (accounted in /proc/net/softnet_stat) > - bad vlan tag (not accounted) > - unknown/unregistered protocol (not accounted) > > We can handle a per-device counter of such dropped frames at core level, > and automatically adds it to the device provided stats (rx_dropped), so > that standard tools can be used (ifconfig, ip link, cat /proc/net/dev) > > This is a generalization of commit 8990f468a (net: rx_dropped > accounting), thus reverting it. > > Signed-off-by: Eric Dumazet <eric.dumazet@xxxxxxxxx> > Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> -- albert chin (china@xxxxxxxxxxxxxxxxxx) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html