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Date: Mon, 16 Mar 2009 20:01:01 +0100 From: Eric Dumazet <dada1@...mosbay.com> To: Dave Boutcher <daveboutcher@...il.com> CC: netdev@...r.kernel.org Subject: Re: IGMP Join dropping multicast packets Dave Boutcher a écrit : > On Sat, Mar 14, 2009 at 9:37 PM, Eric Dumazet <dada1@...mosbay.com> wrote: >> Dave Boutcher a écrit : >>> I'm running into an interesting problem with joining multiple >>> multicast feeds. If you join multiple multicast feeds using >>> setsockopt(...,IP_ADD_MEMBERSHIP...) it causes packets on UNRELATED >>> multicast feeds to get dropped. We have a multicast feed on a rock >>> solid network, and we were very surprised to see dropped packets. The >>> cause was a different process/program being run by a different user >>> joining a bunch of mulitcast feeds. >> I could not reproduce the problem on my machines (bnx2 adapter), even if changing >> NUMSOCK from 55 to 200 in joiner.c > > Thanks for trying Eric. Based on your email I did some more testing > and thus far I've > only recreated this on x86_64 arches, not on i386. Which arch did you > try it on? I tried both, 32 and 64 bit kernels. No problems so far. Could you post a linux kernel .config of a non 'working' machine, and dmesg output ? > >> Is your network a 100Mb one or Gigabit ? >> Try to slow down your joiner ? >> (Could be a flood of IGMP messages your router/switch cannot cope with) >> >> Please describe your "rock solid" network setup (kind of network adapters you have, kind of router...) > > The problem originally manifest itself at work on a 24-core Dell > server with 6 NICs. The network > is gigabit with a Cisco 4900 switch. I recreated it in my basement on > my little white-box > system and a cheap netgear switch. The NIC at work is Intel e1000e > driver, the one > at home is also e1000. > >> If using tcpdump to force promiscuous mode on the device also triggers packet losses ? >> >> (see also ifconfig ethX promisc|allmulti) > > I haven't had a chance to play with promiscuous yet... > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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