On Mon, 4 Mar 2013, Eric Dumazet wrote:
> On Tue, 2013-03-05 at 11:47 +0800, Cong Wang wrote: > > (Cc'ing the right netdev mailing list...) > > > > On 03/05/2013 08:01 AM, dormando wrote: > > > Hi! > > > > > > I have a (core lockup?) with 3.7.6+ and 3.8.2 which appears to be under > > > ixgbe. The machine appears to still be up but network stays in a severely > > > hobbled state. Either lagging or not responding to the network at all. > > > > > > On a new box the hang happens within 8-24 hours of giving it production > > > network traffic. On an older machine (6 cores instead of 8, etc) it can > > > run for a week or more before hanging. > > > > > > The hang from 3.7 might be slightly different than 3.8. They seem to be > > > mostly the same aside from 3.8 hanging in the GRO path. Don't see anything > > > obvious in 3.9-rc1 that would fix it, and haven't tried 3.9-rc1. > > > > > > I've not yet figured out how to reproduce outside of production (as > > > always, sigh). This doesn't seem to happen with 3.6.6, but we have > > > different and less frequent kernel panics there. > > > > > Dornando, do you use any kind of special setup, external modules, > or netfilter ? (iptables-save output would help) > > Is it a pristine kernel, or a modified one ? > (Sigh. sorry for the misfire, thanks for fixing cc). No 3rd party modules. There's a tiny patch for controlling initcwnd from userspace and another one for the extra_free_kbytes tunable that I brought up in another thread. We've had the initcwnd patch in for a long time without trouble. The extra_free_kbytes tunable isn't even being used yet, so all that's doing is adding a 0 somewhere. Only two iptables rules loaded: global NOTRACK rules for PREROUTING/OUTPUT in raw. Kernel's as close to pristine as I can make it. We had the 10g patch in but I've dropped it. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/