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![]() Use of percpu_counter structure to track count of orphaned sockets is causing problems on modern hosts with 256 cpus or more. Stefan Bach reported a serious spinlock contention in real workloads, that I was able to reproduce with a netfilter rule dropping incoming FIN packets. 53.56% server [kernel.kallsyms] [k] queued_spin_lock_slowpath | ---queued_spin_lock_slowpath | --53.51%--_raw_spin_lock_irqsave | --53.51%--__percpu_counter_sum tcp_check_oom | |--39.03%--__tcp_close | tcp_close | inet_release | inet6_release | sock_close | __fput | ____fput | task_work_run | exit_to_usermode_loop | do_syscall_64 | entry_SYSCALL_64_after_hwframe | __GI___libc_close | --14.48%--tcp_out_of_resources tcp_write_timeout tcp_retransmit_timer tcp_write_timer_handler tcp_write_timer call_timer_fn expire_timers __run_timers run_timer_softirq __softirqentry_text_start As explained in commit |
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.. | ||
ccids | ||
ackvec.c | ||
ackvec.h | ||
ccid.c | ||
ccid.h | ||
dccp.h | ||
diag.c | ||
feat.c | ||
feat.h | ||
input.c | ||
ipv4.c | ||
ipv6.c | ||
ipv6.h | ||
Kconfig | ||
Makefile | ||
minisocks.c | ||
options.c | ||
output.c | ||
proto.c | ||
qpolicy.c | ||
sysctl.c | ||
timer.c | ||
trace.h |