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Date: Tue, 9 Nov 2010 17:30:22 +1100
From: Andrew Hendry <andrew.hendry@...il.com>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: Jesper Dangaard Brouer <jdb@...x.dk>,
netdev <netdev@...r.kernel.org>
Subject: Re: Loopback performance from kernel 2.6.12 to 2.6.37
most my slowdown was kmemleak left on.
After fixing its is still a lot slower than your dev system
.
# time dd if=/dev/zero bs=1M count=10000 | netcat 127.0.0.1 9999
10000+0 records in
10000+0 records out
10485760000 bytes (10 GB) copied, 25.8182 s, 406 MB/s
real 0m25.821s
user 0m1.502s
sys 0m33.463s
------------------------------------------------------------------------------------------------------------------
PerfTop: 241 irqs/sec kernel:56.8% exact: 0.0% [1000Hz
cycles], (all, 8 CPUs)
------------------------------------------------------------------------------------------------------------------
samples pcnt function DSO
_______ _____ ___________________________
______________________________________
1255.00 8.7% hpet_msi_next_event
/lib/modules/2.6.37-rc1+/build/vmlinux
1081.00 7.5% copy_user_generic_string
/lib/modules/2.6.37-rc1+/build/vmlinux
863.00 6.0% __ticket_spin_lock
/lib/modules/2.6.37-rc1+/build/vmlinux
498.00 3.5% do_sys_poll
/lib/modules/2.6.37-rc1+/build/vmlinux
455.00 3.2% system_call
/lib/modules/2.6.37-rc1+/build/vmlinux
409.00 2.8% fget_light
/lib/modules/2.6.37-rc1+/build/vmlinux
348.00 2.4% tcp_sendmsg
/lib/modules/2.6.37-rc1+/build/vmlinux
269.00 1.9% fsnotify
/lib/modules/2.6.37-rc1+/build/vmlinux
258.00 1.8% _raw_spin_unlock_irqrestore
/lib/modules/2.6.37-rc1+/build/vmlinux
223.00 1.6% _raw_spin_lock_irqsave
/lib/modules/2.6.37-rc1+/build/vmlinux
203.00 1.4% __clear_user
/lib/modules/2.6.37-rc1+/build/vmlinux
184.00 1.3% tcp_poll
/lib/modules/2.6.37-rc1+/build/vmlinux
178.00 1.2% vfs_write
/lib/modules/2.6.37-rc1+/build/vmlinux
165.00 1.1% tcp_recvmsg
/lib/modules/2.6.37-rc1+/build/vmlinux
152.00 1.1% pipe_read
/lib/modules/2.6.37-rc1+/build/vmlinux
149.00 1.0% schedule
/lib/modules/2.6.37-rc1+/build/vmlinux
135.00 0.9% rw_verify_area
/lib/modules/2.6.37-rc1+/build/vmlinux
135.00 0.9% __pollwait
/lib/modules/2.6.37-rc1+/build/vmlinux
130.00 0.9% __write
/lib/libc-2.12.1.so
127.00 0.9% __ticket_spin_unlock
/lib/modules/2.6.37-rc1+/build/vmlinux
126.00 0.9% __poll
/lib/libc-2.12.1.so
On Tue, Nov 9, 2010 at 5:23 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le mardi 09 novembre 2010 à 06:22 +0100, Eric Dumazet a écrit :
>> Le mardi 09 novembre 2010 à 11:05 +1100, Andrew Hendry a écrit :
>> > results on an i7 860 @ 2.80Ghz machine, no virtualization involved. 2.6.37-rc1+
>> >
>> > # time dd if=/dev/zero bs=1M count=10000 | netcat 127.0.0.1 9999
>> > 10000+0 records in
>> > 10000+0 records out
>> > 10485760000 bytes (10 GB) copied, 50.2022 s, 209 MB/s
>> >
>> > real 0m50.210s
>> > user 0m1.094s
>> > sys 0m57.589s
>>
>> Thanks !
>>
>> Could you take a pef snapshot during the test ?
>>
>> # perf record -a -g sleep 10
>> # perf report
>>
>>
>
> 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>
>
>
>
>
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