On Wed, Dec 4, 2013 at 1:10 AM, Or Gerlitz <or.gerlitz@xxxxxxxxx> wrote: > On Tue, Dec 3, 2013 at 11:55 PM, Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote: >> On Tue, 2013-12-03 at 16:50 -0500, David Miller wrote: >> >>> At this point I would use drop monitor to figure out in what context >>> packets are being dropped on the floor. There are scripts provided >>> with the perf tool to utilize it. >> >> Most easy way is to do : >> >> perf record -e skb:kfree_skb -a -g sleep 10 >> perf report > > $ ./perf record -e skb:kfree_skb -g -a sleep 10 > $ ./perf report -i perf.data > > > Samples: 883K of event 'skb:kfree_skb', Event count (approx.): 883406 > + 97.13% swapper [kernel.kallsyms] [k] net_tx_action > + 1.53% iperf [kernel.kallsyms] [k] net_tx_action > + 1.03% perf [kernel.kallsyms] [k] net_tx_action > + 0.27% ksoftirqd/7 [kernel.kallsyms] [k] net_tx_action > + 0.03% kworker/7:1 [kernel.kallsyms] [k] net_tx_action > + 0.00% rpcbind [kernel.kallsyms] [k] net_tx_action > + 0.00% swapper [kernel.kallsyms] [k] kfree_skb > + 0.00% sleep [kernel.kallsyms] [k] net_tx_action > + 0.00% hald-addon-acpi [kernel.kallsyms] [k] kfree_skb > + 0.00% iperf [kernel.kallsyms] [k] kfree_skb > + 0.00% perf [kernel.kallsyms] [k] kfree_skb I added proper sorting (thanks Rick), here's the passive side report - 99.99% [kernel.kallsyms] [k] net_tx_action ? - net_tx_action ? - 59.20% __libc_recv ? 100.00% 0 ? - 35.61% __write_nocancel ? - 100.00% run_builtin ? main ? __libc_start_main ? - 2.60% __poll ? - 92.62% run_builtin ? main ? __libc_start_main ? - 7.38% 0x7f2d4c4adfd4 ? 0x626370523a32333a ? - 1.86% cmd_record ? run_builtin ? main ? __libc_start_main ? - 0.01% [kernel.kallsyms] [k] kfree_skb ? - kfree_skb ? - 50.00% __connect_nocancel ? 0x64697063612f6e75 ? - 33.33% __libc_recv ? 0 ? - 16.67% __write_nocancel ? run_builtin ? main ? __libc_start_main and the active side report 100.00% [kernel.kallsyms] [k] net_tx_action ? - net_tx_action ? - 76.91% __write_nocancel ? - 100.00% run_builtin ? main ? __libc_start_main ? 15.92% 0x37cc60e4ed ? - 2.69% __poll ? run_builtin ? main ? __libc_start_main ? - 1.92% cmd_record ? run_builtin ? main ? __libc_start_main ? - 1.66% pthread_cond_signal@@GLIBC_2. 3.2 ? 0x10000 ? - 0.52% perf_header__has_feat ? - 73.28% run_builtin ? main ? __libc_start_main ? - 26.72% cmd_record ? run_builtin ? main ? __libc_start_main ? - 0.00% [kernel.kallsyms] [k] kfree_skb ? - kfree_skb ? - 100.00% __GI___connect_internal ? - 50.00% get_mapping ? __nscd_get_map_ref ? 50.00% __nscd_open_socket > > > >> >> >> -- 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