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SubjectRe: BFS vs. mainline scheduler benchmarks and measurements

* Michael Buesch <mb@bu3sch.de> wrote:

> Here's a very simple test setup on an embedded singlecore bcm47xx
> machine (WL500GPv2) It uses iperf for performance testing. The
> iperf server is run on the embedded device. The device is so slow
> that the iperf test is completely CPU bound. The network
> connection is a 100MBit on the device connected via patch cable to
> a 1000MBit machine.
>
> The kernel is openwrt-2.6.30.5.
>
> Here are the results:
>
>
>
> Mainline CFS scheduler:
>
> mb@homer:~$ iperf -c 192.168.1.1
> ------------------------------------------------------------
> Client connecting to 192.168.1.1, TCP port 5001
> TCP window size: 16.0 KByte (default)
> ------------------------------------------------------------
> [ 3] local 192.168.1.99 port 35793 connected with 192.168.1.1 port 5001
> [ ID] Interval Transfer Bandwidth
> [ 3] 0.0-10.0 sec 27.4 MBytes 23.0 Mbits/sec
> mb@homer:~$ iperf -c 192.168.1.1
> ------------------------------------------------------------
> Client connecting to 192.168.1.1, TCP port 5001
> TCP window size: 16.0 KByte (default)
> ------------------------------------------------------------
> [ 3] local 192.168.1.99 port 35794 connected with 192.168.1.1 port 5001
> [ ID] Interval Transfer Bandwidth
> [ 3] 0.0-10.0 sec 27.3 MBytes 22.9 Mbits/sec
> mb@homer:~$ iperf -c 192.168.1.1
> ------------------------------------------------------------
> Client connecting to 192.168.1.1, TCP port 5001
> TCP window size: 16.0 KByte (default)
> ------------------------------------------------------------
> [ 3] local 192.168.1.99 port 56147 connected with 192.168.1.1 port 5001
> [ ID] Interval Transfer Bandwidth
> [ 3] 0.0-10.0 sec 27.3 MBytes 22.9 Mbits/sec
>
>
> BFS scheduler:
>
> mb@homer:~$ iperf -c 192.168.1.1
> ------------------------------------------------------------
> Client connecting to 192.168.1.1, TCP port 5001
> TCP window size: 16.0 KByte (default)
> ------------------------------------------------------------
> [ 3] local 192.168.1.99 port 52489 connected with 192.168.1.1 port 5001
> [ ID] Interval Transfer Bandwidth
> [ 3] 0.0-10.0 sec 38.2 MBytes 32.0 Mbits/sec
> mb@homer:~$ iperf -c 192.168.1.1
> ------------------------------------------------------------
> Client connecting to 192.168.1.1, TCP port 5001
> TCP window size: 16.0 KByte (default)
> ------------------------------------------------------------
> [ 3] local 192.168.1.99 port 52490 connected with 192.168.1.1 port 5001
> [ ID] Interval Transfer Bandwidth
> [ 3] 0.0-10.0 sec 38.1 MBytes 31.9 Mbits/sec
> mb@homer:~$ iperf -c 192.168.1.1
> ------------------------------------------------------------
> Client connecting to 192.168.1.1, TCP port 5001
> TCP window size: 16.0 KByte (default)
> ------------------------------------------------------------
> [ 3] local 192.168.1.99 port 52491 connected with 192.168.1.1 port 5001
> [ ID] Interval Transfer Bandwidth
> [ 3] 0.0-10.0 sec 38.1 MBytes 31.9 Mbits/sec

That's interesting. I tried to reproduce it on x86, but the profile
does not show any scheduler overhead at all on the server:

$ perf report

#
# Samples: 8369
#
# Overhead Symbol
# ........ ......
#
9.20% [k] copy_user_generic_string
3.80% [k] e1000_clean
3.58% [k] ipt_do_table
2.72% [k] mwait_idle
2.68% [k] nf_iterate
2.28% [k] e1000_intr
2.15% [k] tcp_packet
2.10% [k] __hash_conntrack
1.59% [k] read_tsc
1.52% [k] _local_bh_enable_ip
1.34% [k] eth_type_trans
1.29% [k] __alloc_skb
1.19% [k] tcp_recvmsg
1.19% [k] ip_rcv
1.17% [k] e1000_clean_rx_irq
1.12% [k] apic_timer_interrupt
0.99% [k] vsnprintf
0.96% [k] nf_conntrack_in
0.96% [k] kmem_cache_free
0.93% [k] __kmalloc_track_caller

Could you profile it please? Also, what's the context-switch rate?

Below is the call-graph profile as well - all the overhead is in
networking and SLAB.

Ingo

$ perf report --call-graph fractal,5

#
# Samples: 8947
#
# Overhead Command Shared Object Symbol
# ........ .............. ............................. ......
#
9.06% iperf [kernel] [k] copy_user_generic_string
|
|--98.89%-- skb_copy_datagram_iovec
| |
| |--77.18%-- tcp_recvmsg
| | sock_common_recvmsg
| | __sock_recvmsg
| | sock_recvmsg
| | sys_recvfrom
| | system_call_fastpath
| | __recv
| |
| --22.82%-- tcp_rcv_established
| tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--1.11%-- system_call_fastpath
__GI___libc_nanosleep
3.62% [init] [kernel] [k] e1000_clean
2.96% [init] [kernel] [k] ipt_do_table
2.79% [init] [kernel] [k] mwait_idle
2.22% [init] [kernel] [k] e1000_intr
1.93% [init] [kernel] [k] nf_iterate
1.65% [init] [kernel] [k] __hash_conntrack
1.52% [init] [kernel] [k] tcp_packet
1.29% [init] [kernel] [k] ip_rcv
1.18% [init] [kernel] [k] __alloc_skb
1.15% iperf [kernel] [k] tcp_recvmsg

1.04% [init] [kernel] [k] _local_bh_enable_ip
1.02% [init] [kernel] [k] apic_timer_interrupt
1.02% [init] [kernel] [k] eth_type_trans
1.01% [init] [kernel] [k] tcp_v4_rcv
0.96% iperf [kernel] [k] kfree
|
|--95.35%-- skb_release_data
| __kfree_skb
| |
| |--79.27%-- tcp_recvmsg
| | sock_common_recvmsg
| | __sock_recvmsg
| | sock_recvmsg
| | sys_recvfrom
| | system_call_fastpath
| | __recv
| |
| --20.73%-- tcp_rcv_established
| tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--4.65%-- __kfree_skb
|
|--75.00%-- tcp_rcv_established
| tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--25.00%-- tcp_recvmsg
sock_common_recvmsg
__sock_recvmsg
sock_recvmsg
sys_recvfrom
system_call_fastpath
__recv
0.96% [init] [kernel] [k] read_tsc
0.92% iperf [kernel] [k] tcp_v4_do_rcv
|
|--95.12%-- tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--4.88%-- tcp_recvmsg
sock_common_recvmsg
__sock_recvmsg
sock_recvmsg
sys_recvfrom
system_call_fastpath
__recv
0.92% [init] [kernel] [k] e1000_clean_rx_irq
0.86% iperf [kernel] [k] tcp_rcv_established
|
|--96.10%-- tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--3.90%-- tcp_prequeue_process
tcp_recvmsg
sock_common_recvmsg
__sock_recvmsg
sock_recvmsg
sys_recvfrom
system_call_fastpath
__recv
0.84% iperf [kernel] [k] kmem_cache_free
|
|--93.33%-- __kfree_skb
| |
| |--71.43%-- tcp_recvmsg
| | sock_common_recvmsg
| | __sock_recvmsg
| | sock_recvmsg
| | sys_recvfrom
| | system_call_fastpath
| | __recv
| |
| --28.57%-- tcp_rcv_established
| tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
|--4.00%-- tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--2.67%-- tcp_rcv_established
tcp_v4_do_rcv
tcp_prequeue_process
tcp_recvmsg
sock_common_recvmsg
__sock_recvmsg
sock_recvmsg
sys_recvfrom
system_call_fastpath
__recv
0.80% [init] [kernel] [k] netif_receive_skb
0.79% iperf [kernel] [k] tcp_event_data_recv
|
|--83.10%-- tcp_rcv_established
| tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
|--12.68%-- tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--4.23%-- tcp_data_queue
tcp_rcv_established
tcp_v4_do_rcv
tcp_prequeue_process
tcp_recvmsg
sock_common_recvmsg
__sock_recvmsg
sock_recvmsg
sys_recvfrom
system_call_fastpath
__recv
0.67% perf [kernel] [k] format_decode
|
|--91.67%-- vsnprintf
| seq_printf
| |
| |--67.27%-- show_map_vma
| | show_map
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI_read
| |
| |--23.64%-- render_sigset_t
| | proc_pid_status
| | proc_single_show
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI_read
| |
| |--7.27%-- proc_pid_status
| | proc_single_show
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI_read
| |
| --1.82%-- cpuset_task_status_allowed
| proc_pid_status
| proc_single_show
| seq_read
| vfs_read
| sys_read
| system_call_fastpath
| __GI_read
|
--8.33%-- seq_printf
|
|--60.00%-- proc_pid_status
| proc_single_show
| seq_read
| vfs_read
| sys_read
| system_call_fastpath
| __GI_read
|
--40.00%-- show_map_vma
show_map
seq_read
vfs_read
sys_read
system_call_fastpath
__GI_read
0.65% [init] [kernel] [k] __kmalloc_track_caller
0.63% [init] [kernel] [k] nf_conntrack_in
0.63% [init] [kernel] [k] ip_route_input
0.58% perf [kernel] [k] vsnprintf
|
|--98.08%-- seq_printf
| |
| |--60.78%-- show_map_vma
| | show_map
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI_read
| |
| |--19.61%-- render_sigset_t
| | proc_pid_status
| | proc_single_show
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI_read
| |
| |--9.80%-- proc_pid_status
| | proc_single_show
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI_read
| |
| |--3.92%-- task_mem
| | proc_pid_status
| | proc_single_show
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI_read
| |
| |--3.92%-- cpuset_task_status_allowed
| | proc_pid_status
| | proc_single_show
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI_read
| |
| --1.96%-- render_cap_t
| proc_pid_status
| proc_single_show
| seq_read
| vfs_read
| sys_read
| system_call_fastpath
| __GI_read
|
--1.92%-- snprintf
proc_task_readdir
vfs_readdir
sys_getdents
system_call_fastpath
__getdents64
0x69706565000a3430
0.57% [init] [kernel] [k] ktime_get
0.57% [init] [kernel] [k] nf_nat_fn
0.56% iperf [kernel] [k] tcp_packet
|
|--68.00%-- __tcp_ack_snd_check
| tcp_rcv_established
| tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--32.00%-- tcp_cleanup_rbuf
tcp_recvmsg
sock_common_recvmsg
__sock_recvmsg
sock_recvmsg
sys_recvfrom
system_call_fastpath
__recv
0.56% iperf /usr/bin/iperf [.] 0x000000000059f8
|
|--8.00%-- 0x4059f8
|
|--8.00%-- 0x405a16
|
|--8.00%-- 0x4059fd
|
|--4.00%-- 0x409d22
|
|--4.00%-- 0x405871
|
|--4.00%-- 0x406ee1
|
|--4.00%-- 0x405726
|
|--4.00%-- 0x4058db
|
|--4.00%-- 0x406ee8
|
|--2.00%-- 0x405b60
|
|--2.00%-- 0x4058fd
|
|--2.00%-- 0x4058d5
|
|--2.00%-- 0x405490
|
|--2.00%-- 0x4058bb
|
|--2.00%-- 0x405b93
|
|--2.00%-- 0x405b8e
|
|--2.00%-- 0x405903
|
|--2.00%-- 0x405ba8
|
|--2.00%-- 0x406eae
|
|--2.00%-- 0x405545
|
|--2.00%-- 0x405870
|
|--2.00%-- 0x405b67
|
|--2.00%-- 0x4058ce
|
|--2.00%-- 0x40570e
|
|--2.00%-- 0x406ee4
|
|--2.00%-- 0x405a02
|
|--2.00%-- 0x406eec
|
|--2.00%-- 0x405b82
|
|--2.00%-- 0x40556a
|
|--2.00%-- 0x405755
|
|--2.00%-- 0x405a0a
|
|--2.00%-- 0x405498
|
|--2.00%-- 0x409d20
|
|--2.00%-- 0x405b21
|
--2.00%-- 0x405a2c
0.56% [init] [kernel] [k] kmem_cache_alloc
0.56% [init] [kernel] [k] __inet_lookup_established
0.55% perf [kernel] [k] number
|
|--95.92%-- vsnprintf
| |
| |--97.87%-- seq_printf
| | |
| | |--56.52%-- show_map_vma
| | | show_map
| | | seq_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __GI_read
| | |
| | |--28.26%-- render_sigset_t
| | | proc_pid_status
| | | proc_single_show
| | | seq_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __GI_read
| | |
| | |--6.52%-- proc_pid_status
| | | proc_single_show
| | | seq_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __GI_read
| | |
| | |--4.35%-- render_cap_t
| | | proc_pid_status
| | | proc_single_show
| | | seq_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __GI_read
| | |
| | --4.35%-- task_mem
| | proc_pid_status
| | proc_single_show
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI_read
| |
| --2.13%-- scnprintf
| bitmap_scnlistprintf
| seq_bitmap_list
| cpuset_task_status_allowed
| proc_pid_status
| proc_single_show
| seq_read
| vfs_read
| sys_read
| system_call_fastpath
| __GI_read
|
--4.08%-- seq_printf
|
|--50.00%-- show_map_vma
| show_map
| seq_read
| vfs_read
| sys_read
| system_call_fastpath
| __GI_read
|
--50.00%-- render_sigset_t
proc_pid_status
proc_single_show
seq_read
vfs_read
sys_read
system_call_fastpath
__GI_read
0.55% [init] [kernel] [k] native_sched_clock
0.50% iperf [kernel] [k] e1000_xmit_frame
|
|--71.11%-- __tcp_ack_snd_check
| tcp_rcv_established
| tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--28.89%-- tcp_cleanup_rbuf
tcp_recvmsg
sock_common_recvmsg
__sock_recvmsg
sock_recvmsg
sys_recvfrom
system_call_fastpath
__recv
0.50% iperf [kernel] [k] ipt_do_table
|
|--37.78%-- ipt_local_hook
| nf_iterate
| nf_hook_slow
| __ip_local_out
| ip_local_out
| ip_queue_xmit
| tcp_transmit_skb
| tcp_send_ack
| |
| |--58.82%-- __tcp_ack_snd_check
| | tcp_rcv_established
| | tcp_v4_do_rcv
| | tcp_prequeue_process
| | tcp_recvmsg
| | sock_common_recvmsg
| | __sock_recvmsg
| | sock_recvmsg
| | sys_recvfrom
| | system_call_fastpath
| | __recv
| |
| --41.18%-- tcp_cleanup_rbuf
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
|--31.11%-- ipt_post_routing_hook
| nf_iterate
| nf_hook_slow
| ip_output
| ip_local_out
| ip_queue_xmit
| tcp_transmit_skb
| tcp_send_ack
| |
| |--64.29%-- __tcp_ack_snd_check
| | tcp_rcv_established
| | tcp_v4_do_rcv
| | tcp_prequeue_process
| | tcp_recvmsg
| | sock_common_recvmsg
| | __sock_recvmsg
| | sock_recvmsg
| | sys_recvfrom
| | system_call_fastpath
| | __recv
| |
| --35.71%-- tcp_cleanup_rbuf
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
|--20.00%-- ipt_local_out_hook
| nf_iterate
| nf_hook_slow
| __ip_local_out
| ip_local_out
| ip_queue_xmit
| tcp_transmit_skb
| tcp_send_ack
| |
| |--88.89%-- __tcp_ack_snd_check
| | tcp_rcv_established
| | tcp_v4_do_rcv
| | tcp_prequeue_process
| | tcp_recvmsg
| | sock_common_recvmsg
| | __sock_recvmsg
| | sock_recvmsg
| | sys_recvfrom
| | system_call_fastpath
| | __recv
| |
| --11.11%-- tcp_cleanup_rbuf
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
|--6.67%-- nf_iterate
| nf_hook_slow
| |
| |--66.67%-- ip_output
| | ip_local_out
| | ip_queue_xmit
| | tcp_transmit_skb
| | tcp_send_ack
| | tcp_cleanup_rbuf
| | tcp_recvmsg
| | sock_common_recvmsg
| | __sock_recvmsg
| | sock_recvmsg
| | sys_recvfrom
| | system_call_fastpath
| | __recv
| |
| --33.33%-- __ip_local_out
| ip_local_out
| ip_queue_xmit
| tcp_transmit_skb
| tcp_send_ack
| __tcp_ack_snd_check
| tcp_rcv_established
| tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
|--2.22%-- ipt_local_in_hook
| nf_iterate
| nf_hook_slow
| ip_local_deliver
| ip_rcv_finish
| ip_rcv
| netif_receive_skb
| napi_skb_finish
| napi_gro_receive
| e1000_receive_skb
| e1000_clean_rx_irq
| e1000_clean
| net_rx_action
| __do_softirq
| call_softirq
| do_softirq
| irq_exit
| do_IRQ
| ret_from_intr
| vgettimeofday
|
--2.22%-- ipt_pre_routing_hook
nf_iterate
nf_hook_slow
ip_rcv
netif_receive_skb
napi_skb_finish
napi_gro_receive
e1000_receive_skb
e1000_clean_rx_irq
e1000_clean
net_rx_action
__do_softirq
call_softirq
do_softirq
irq_exit
do_IRQ
ret_from_intr
__GI___libc_nanosleep
0.50% iperf [kernel] [k] schedule
|
|--57.78%-- do_nanosleep
| hrtimer_nanosleep
| sys_nanosleep
| system_call_fastpath
| __GI___libc_nanosleep
|
|--33.33%-- schedule_timeout
| sk_wait_data
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
|--6.67%-- hrtimer_nanosleep
| sys_nanosleep
| system_call_fastpath
| __GI___libc_nanosleep
|
--2.22%-- sk_wait_data
tcp_recvmsg
sock_common_recvmsg
__sock_recvmsg
sock_recvmsg
sys_recvfrom
system_call_fastpath
__recv
0.49% iperf [kernel] [k] tcp_transmit_skb
|
|--97.73%-- tcp_send_ack
| |
| |--83.72%-- __tcp_ack_snd_check
| | tcp_rcv_established
| | tcp_v4_do_rcv
| | |
| | |--97.22%-- tcp_prequeue_process
| | | tcp_recvmsg
| | | sock_common_recvmsg
| | | __sock_recvmsg
| | | sock_recvmsg
| | | sys_recvfrom
| | | system_call_fastpath
| | | __recv
| | |
| | --2.78%-- release_sock
| | tcp_recvmsg
| | sock_common_recvmsg
| | __sock_recvmsg
| | sock_recvmsg
| | sys_recvfrom
| | system_call_fastpath
| | __recv
| |
| --16.28%-- tcp_cleanup_rbuf
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--2.27%-- __tcp_ack_snd_check
tcp_rcv_established
tcp_v4_do_rcv
tcp_prequeue_process
tcp_recvmsg
sock_common_recvmsg
__sock_recvmsg
sock_recvmsg
sys_recvfrom
system_call_fastpath
__recv
0.49% [init] [kernel] [k] nf_hook_slow
0.48% iperf [kernel] [k] virt_to_head_page
|
|--53.49%-- kfree
| skb_release_data
| __kfree_skb
| |
| |--65.22%-- tcp_recvmsg
| | sock_common_recvmsg
| | __sock_recvmsg
| | sock_recvmsg
| | sys_recvfrom
| | system_call_fastpath
| | __recv
| |
| --34.78%-- tcp_rcv_established
| tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
|--18.60%-- skb_release_data
| __kfree_skb
| |
| |--62.50%-- tcp_rcv_established
| | tcp_v4_do_rcv
| | tcp_prequeue_process
| | tcp_recvmsg
| | sock_common_recvmsg
| | __sock_recvmsg
| | sock_recvmsg
| | sys_recvfrom
| | system_call_fastpath
| | __recv
| |
| --37.50%-- tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
|--18.60%-- kmem_cache_free
| __kfree_skb
| |
| |--62.50%-- tcp_rcv_established
| | tcp_v4_do_rcv
| | tcp_prequeue_process
| | tcp_recvmsg
| | sock_common_recvmsg
| | __sock_recvmsg
| | sock_recvmsg
| | sys_recvfrom
| | system_call_fastpath
| | __recv
| |
| --37.50%-- tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--9.30%-- __kfree_skb
|
|--75.00%-- tcp_rcv_established
| tcp_v4_do_rcv
| tcp_prequeue_process
| tcp_recvmsg
| sock_common_recvmsg
| __sock_recvmsg
| sock_recvmsg
| sys_recvfrom
| system_call_fastpath
| __recv
|
--25.00%-- tcp_recvmsg
sock_common_recvmsg
__sock_recvmsg
sock_recvmsg
sys_recvfrom
system_call_fastpath
__recv
...

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  Last update: 2009-09-07 20:29    [from the cache]
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