From: cold cold <nedkonedev@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: netdev@vger.kernel.org
Subject: Re: 0% cpu usasge after fresh boot or net restart but 10% CPU if kernel flush route cache
Date: Thu, 28 Jan 2010 18:26:50 +0200 [thread overview]
Message-ID: <41ac0f9e1001280826j1a4e6caar47ccfd357b6feb37@mail.gmail.com> (raw)
In-Reply-To: <1264694957.2930.15.camel@edumazet-laptop>
On Thu, Jan 28, 2010 at 6:09 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> Le jeudi 28 janvier 2010 à 11:14 +0200, cold cold a écrit :
>
>>
>> RX Kpps : 57 TX Kpps : 53 RX Kbits : 331184 TX Kbits : 306213
>> RX Kpps : 59 TX Kpps : 54 RX Kbits : 345517 TX Kbits : 304323
>> RX Kpps : 56 TX Kpps : 52 RX Kbits : 331418 TX Kbits : 296032
>> RX Kpps : 60 TX Kpps : 54 RX Kbits : 362007 TX Kbits : 297371
>> RX Kpps : 59 TX Kpps : 52 RX Kbits : 360455 TX Kbits : 280603
>>
>>
>> ON one cpu, gc_interval to 1, gc_elasticity 2
>>
>> Cpu0 : 0.0%us, 0.0%sy, 0.0%ni, 72.0%id, 0.0%wa, 8.3%hi, 19.7%si, 0.0%st
>> Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
>> Cpu2 : 0.0%us, 0.3%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
>> Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
>>
>> ------------------------------------------------------------------------------
>> PerfTop: 17064 irqs/sec kernel:98.0% [100000 cycles], (all, 4 CPUs)
>> ------------------------------------------------------------------------------
>>
>> samples pcnt kernel function
>> _______ _____ _______________
>>
>> 40388.00 - 27.8% : acpi_idle_do_entry
>> 24651.00 - 17.0% : read_hpet
>> 4271.00 - 2.9% : _spin_lock
>> 3388.00 - 2.3% : pskb_expand_head
>> 3288.00 - 2.3% : igb_poll [igb]
>> 3246.00 - 2.2% : irq_entries_start
>> 2868.00 - 2.0% : dev_gro_receive
>> 2665.00 - 1.8% : igb_xmit_frame_adv [igb]
>> 2513.00 - 1.7% : ip_route_input
>> 2144.00 - 1.5% : igb_clean_tx_irq [igb]
>> 1842.00 - 1.3% : __slab_free
>> 1544.00 - 1.1% : dev_queue_xmit
>> 1423.00 - 1.0% : igb_msix_rx [igb]
>> 1353.00 - 0.9% : __alloc_skb
>> 1285.00 - 0.9% : eth_type_trans
>> --
>
> All this seems pretty normal profile (regarding networking functions),
> your machine should scale without problem.
>
> Of course, the two first functions (acpi_idle_do_entry() & read_hpet())
> look suspicious but I have no idea why.
>
i make with flushing without gc on 2 cpu 2 time more traffic and CPU
usage about 5 times less
top - 11:22:04 up 6:45, 5 users, load average: 0.00, 0.10, 0.25
Tasks: 84 total, 1 running, 83 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 0.3%sy, 0.0%ni, 94.0%id, 0.0%wa, 1.7%hi, 4.0%si, 0.0%st
Cpu1 : 0.3%us, 0.0%sy, 0.0%ni, 97.7%id, 0.0%wa, 0.7%hi, 1.3%si, 0.0%st
Cpu2 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
RX Kpps : 90 TX Kpps : 75 RX Kbits : 582791 TX Kbits : 413873
RX Kpps : 87 TX Kpps : 74 RX Kbits : 546327 TX Kbits : 415852
RX Kpps : 87 TX Kpps : 74 RX Kbits : 544820 TX Kbits : 418339
RX Kpps : 88 TX Kpps : 73 RX Kbits : 569143 TX Kbits : 406438
next prev parent reply other threads:[~2010-01-28 16:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-26 16:58 0% cpu usasge after fresh boot or net restart but 10% CPU if kernel flush route cache cold cold
2010-01-27 15:26 ` Eric Dumazet
2010-01-27 19:53 ` cold cold
2010-01-27 21:18 ` Eric Dumazet
2010-01-28 9:14 ` cold cold
2010-01-28 16:09 ` Eric Dumazet
2010-01-28 16:26 ` cold cold [this message]
2010-01-28 17:06 ` Eric Dumazet
2010-01-28 18:49 ` cold cold
2010-01-28 21:16 ` Eric Dumazet
2010-01-29 7:38 ` cold cold
2010-01-29 9:06 ` Eric Dumazet
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