Le mardi 09 novembre 2010 à 06:22 +0100, Eric Dumazet a écrit :
On my laptop
Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz
(2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16 20:45:36 UTC 2010 x86_64
GNU/Linux) :
time dd if=/dev/zero bs=1M count=10000|netcat 127.0.0.1 9999
10000+0 enregistrements lus
10000+0 enregistrements écrits
10485760000 octets (10 GB) copiés, 38,2691 s, 274 MB/s
real 0m38.274s
user 0m1.870s
sys 0m38.370s
perf top result :
-------------------------------------------------------------------------------------------------
PerfTop: 1948 irqs/sec kernel:90.7% exact: 0.0% [1000Hz cycles], (all, 2 CPUs)
-------------------------------------------------------------------------------------------------
samples pcnt function DSO
_______ _____ ___________________________ ___________________
1867.00 12.4% copy_user_generic_string [kernel.kallsyms]
1166.00 7.7% __ticket_spin_lock [kernel.kallsyms]
744.00 4.9% __clear_user [kernel.kallsyms]
667.00 4.4% system_call [kernel.kallsyms]
329.00 2.2% tcp_sendmsg [kernel.kallsyms]
304.00 2.0% schedule [kernel.kallsyms]
257.00 1.7% _raw_spin_unlock_irqrestore [kernel.kallsyms]
231.00 1.5% fget_light [kernel.kallsyms]
216.00 1.4% do_poll [kernel.kallsyms]
203.00 1.3% __read_chk /lib/libc-2.12.1.so
202.00 1.3% __pollwait [kernel.kallsyms]
201.00 1.3% __poll /lib/libc-2.12.1.so
187.00 1.2% system_call_after_swapgs [kernel.kallsyms]
176.00 1.2% __write /lib/libc-2.12.1.so
173.00 1.1% _raw_spin_lock_irqsave [kernel.kallsyms]
163.00 1.1% tcp_recvmsg [kernel.kallsyms]
158.00 1.0% do_sys_poll [kernel.kallsyms]
153.00 1.0% vfs_write [kernel.kallsyms]
143.00 0.9% pipe_read [kernel.kallsyms]
141.00 0.9% fput [kernel.kallsyms]
121.00 0.8% common_file_perm [kernel.kallsyms]
120.00 0.8% _cond_resched [kernel.kallsyms]
# vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
2 0 1456 120056 51572 2606876 0 0 158 41 254 190 9 2 88 0
2 0 1456 120140 51580 2606868 0 0 12 0 758 158309 11 76 13 0
2 0 1456 119520 51588 2606896 0 0 0 176 778 160749 8 80 12 0
2 0 1456 120388 51588 2606896 0 0 0 0 730 158201 9 76 16 0
3 0 1456 120388 51588 2606896 0 0 0 0 745 158490 8 76 16 0
2 0 1456 120520 51588 2606896 0 0 0 0 991 159120 9 78 13 0
2 0 1456 120024 51588 2606896 0 0 0 0 653 160023 10 79 11 0
3 0 1456 120520 51588 2606896 0 0 0 0 659 160614 8 78 14 0
2 0 1456 120272 51596 2606896 0 0 0 80 695 159922 10 75 14 0
4 0 1456 120272 51596 2606896 0 0 0 0 675 158010 7 79 14 0
# powertop
PowerTOP version 1.13 (C) 2007 Intel Corporation
< Detailed C-state information is not P-states (frequencies)
Turbo Mode 43.1%
2.40 Ghz 48.0%
2.00 Ghz 8.2%
1.60 Ghz 0.7%
1200 Mhz 0.1%
Wakeups-from-idle per second : 542.9 interval: 10.0s
no ACPI power usage estimate available
Top causes for wakeups:
21.9% (196.5) [kernel scheduler] Load balancing tick
21.2% (190.7) [Rescheduling interrupts] <kernel IPI>
12.7% (114.0) PS/2 keyboard/mouse/touchpad interrupt
12.0% (107.9) plugin-containe
11.1% ( 99.3) alsa-sink
6.0% ( 53.8) firefox-bin
4.4% ( 39.7) fping
3.9% ( 35.2) Xorg
1.3% ( 11.3) [b43] <interrupt>
1.1% ( 10.0) ksoftirqd/0
0.4% ( 4.0)D nagios3
0.2% ( 1.9)D gnome-terminal
0.7% ( 6.4) [Thermal event interrupts] <kernel IPI>
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
majordomo@vger.kernel.org
More majordomo info at
http://vger.kernel.org/majordomo-info.html
