netdev - Re: rib_trie / Fix inflate_threshold

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Date:	Mon, 29 Jun 2009 09:27:03 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Paweł Staszewski <pstaszewski@...are.pl>
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

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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