netdev - Re: rib_trie / Fix inflate_threshold

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Message-ID: <4A488CDA.1000804@itcare.pl>
Date:	Mon, 29 Jun 2009 11:43:54 +0200
From:	Paweł Staszewski <pstaszewski@...are.pl>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	David Miller <davem@...emloft.net>,
	Robert Olsson <robert@...ur.slu.se>,
	Robert Olsson <Robert.Olsson@...a.slu.se>,
	"Jorge Boncompte [DTI2]" <jorge@...2.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	Robert Olsson <robert.olsson@....uu.se>,
	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: rib_trie / Fix inflate_threshold_root. Now=15 size=11 bits

Jarek Poplawski pisze:
> On Mon, Jun 29, 2009 at 10:47:44AM +0200, Paweł Staszewski wrote:
>   
>> But
>> With all this patches i have the same problem with CPU load
>> Every time when route cache entries are purged cpu load is increasing  
>> from 1% to 40 / 80% it depends
>>
>> I see that on 64bit machine when route cache entries are going down i  
>> have almost 80% load on each cpu where ethernet card is binded by  
>> smp_affinity
>> But on 32bit machine cpu load reported by mpstat is half that on 64bit  
>> machine
>> here is example from 32bit machine ( mpstat + rtstat -k entries )
>>
>> Linux 2.6.29.5 (TM_02_C1)       06/29/09        _i686_  (2 CPU)
>>
>> 12:36:54     CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  
>> %guest   %idle        RT CACHE ENTRIES (from rtstat)
>> 12:36:57     all    0.00    0.00    0.00    0.00    1.51   15.08    0.00  
>>   0.00   83.42        83346
>>     
>
> I guess Eric is thinking about this. Btw., two little suggestions:
> it should be easier to track if these route cache reports stay in its
> starting thread ("weird problem"?), and if you could send these
> stats/logs as attachements or turn off line wrapping, please? ;-)
>
> Thanks,
> Jarek P.
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>
>   
Sorry Jarek for combining problems :)
And yes i will apply next stats in attachements :)

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