Eric Dumazet wrote: > Tobias Diedrich <ranma+kernel@xxxxxxxxxxxx> wrote: > > > Hello, > > > > I suspect I'm seeing a slow dst cache leakage on one of my servers. > > The server in question (oni) regularly needs to be rebooted, because > > it loses network connectivity. However, netconsole and syslog shows that the > > machine is still running and the kernel complains about "dst cache > > overflow". > > > > I have since installed a monitoring script, which stores the output of > > both "ip route ls cache | fgrep cache | wc -l" and the 'entries' value > > of /proc/net/stat/rt_cache (as suggested in > > http://www.mail-archive.com/netdev@xxxxxxxxxxxxxxx/msg02107.html) > > and produces a nice rrd graph: > > > > http://uguu.de/~ranma/route-month-oni.png > > So entries is growing more or less constantly, while the number of > > active routes (not visible on the graph due to being too small) is > > relatively constant. > > > > Comparing this to another host running the exact same kernel: > > http://uguu.de/~ranma/route-month-ari.png > > Here cached_routes and entries barely differ at all. > > > > The funny thing is, both hosts are running the exact same kernel > > and use more or less the same iptables rules. > > > > So I'm not sure what would cause the dst cache to leak only on host > > oni? > > > > Could you send the result of these commands on oni and ari ? > > ip route ls > grep . /proc/sys/net/ipv4/route/* Sure. AFAICS the only visible difference is gc_thresh, which is probably double the size on oni since oni has double the amount of memory (512MB for oni vs. 256MB for ari). Host oni: # ip route ls output: 217.172.187.0/24 dev eth0 proto kernel scope link src 217.172.187.75 default via 217.172.187.1 dev eth0 # grep output: /proc/sys/net/ipv4/route/error_burst:500 /proc/sys/net/ipv4/route/error_cost:100 /proc/sys/net/ipv4/route/gc_elasticity:8 /proc/sys/net/ipv4/route/gc_interval:60 /proc/sys/net/ipv4/route/gc_min_interval:0 /proc/sys/net/ipv4/route/gc_min_interval_ms:500 /proc/sys/net/ipv4/route/gc_thresh:4096 /proc/sys/net/ipv4/route/gc_timeout:300 /proc/sys/net/ipv4/route/max_delay:10 /proc/sys/net/ipv4/route/max_size:65536 /proc/sys/net/ipv4/route/min_adv_mss:256 /proc/sys/net/ipv4/route/min_delay:2 /proc/sys/net/ipv4/route/min_pmtu:552 /proc/sys/net/ipv4/route/mtu_expires:600 /proc/sys/net/ipv4/route/redirect_load:2 /proc/sys/net/ipv4/route/redirect_number:9 /proc/sys/net/ipv4/route/redirect_silence:2048 /proc/sys/net/ipv4/route/secret_interval:600 Host ari: # ip route ls output: 217.160.215.0/24 dev eth0 proto kernel scope link src 217.160.215.119 default via 217.160.215.1 dev eth0 # grep output: /proc/sys/net/ipv4/route/error_burst:500 /proc/sys/net/ipv4/route/error_cost:100 /proc/sys/net/ipv4/route/gc_elasticity:8 /proc/sys/net/ipv4/route/gc_interval:60 /proc/sys/net/ipv4/route/gc_min_interval:0 /proc/sys/net/ipv4/route/gc_min_interval_ms:500 /proc/sys/net/ipv4/route/gc_thresh:2048 /proc/sys/net/ipv4/route/gc_timeout:300 /proc/sys/net/ipv4/route/max_delay:10 /proc/sys/net/ipv4/route/max_size:32768 /proc/sys/net/ipv4/route/min_adv_mss:256 /proc/sys/net/ipv4/route/min_delay:2 /proc/sys/net/ipv4/route/min_pmtu:552 /proc/sys/net/ipv4/route/mtu_expires:600 /proc/sys/net/ipv4/route/redirect_load:2 /proc/sys/net/ipv4/route/redirect_number:9 /proc/sys/net/ipv4/route/redirect_silence:2048 /proc/sys/net/ipv4/route/secret_interval:600 -- Tobias PGP: http://9ac7e0bc.uguu.de このメールは十割再利用されたビットで作られています。 - To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
