Hello developers, I'm seeking some help to debug and solve one of my issues. At GreenWave I'm working on a "SOHO" Router product, and of course we use linux / netfilter. We observed that if we create 30k connections, everything works as expected, but when we start to disconnect them, conntrack (well not confirmed yet fully) makes the kernel side busy, and looks like no scheduling happens. The whole thing works as expected, the only problem it makes our processes and well everything on user side hanging for a couple of seconds 10-30s, which of course triggers our HW Watchdog, and we end up in a reboot. This is of course a corner case, I just would like to understand what's happening. I dig as deep in the code I can, looks like there is a hash table protected by RCU in the code. What I really seek is some help on how could I debug the kernel side things better, to see if it locks on this table long, or why the scheduling is not happening. Some extra info: Kernel: 3.4.108 - armv7l - conntrack compiled into it. ~ # cat /proc/cpuinfo Processor : ARMv7 Processor rev 1 (v7l) processor : 0 BogoMIPS : 1594.16 processor : 1 BogoMIPS : 1594.16 Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x2 CPU part : 0xc09 CPU revision : 1 Hardware : CORTINA-G2 EB Revision : 7542a1 Serial : 0000000000000000 Idle value: ~ # cat /proc/meminfo MemTotal: 436936 kB MemFree: 298336 kB Buffers: 16 kB Cached: 30504 kB SwapCached: 0 kB Thanks a lot in advance ! I really appreciate your work ! -- Br, Peter G. Marczis SW. Developer +45 28 12 92 10 -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
