netdev - Re: [PATCH 1/3] sysfs directory scaling: rbtree for dirent name lookups

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Date:	Tue, 03 Nov 2009 23:06:14 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Benjamin LaHaise <bcrl@...et.ca>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg KH <greg@...ah.com>,
	Octavian Purdila <opurdila@...acom.com>,
	netdev@...r.kernel.org, Cosmin Ratiu <cratiu@...acom.com>
Subject: Re: [PATCH 1/3] sysfs directory scaling: rbtree for dirent name lookups

Benjamin LaHaise a écrit :
> On Tue, Nov 03, 2009 at 01:43:43PM -0800, Eric W. Biederman wrote:
>> I guess in particular what I would expect is that if we can do 35000
>> interfaces in 63s with an O(N^2) algorithm.  Then we should be able to
>> do 35000 interfaces with an O(NlogN) algorithm in under a second.
>> Which for your application should make the time essentially flat in
>> the number of interfaces.
> 
> That's the wrong way to interprete the numbers.  The 35000 number of 63s is 
> the time that it takes 63s to add 5000 more interfaces in the 30,000 to 
> 35,000 range.  This includes the time required to add a point to point ip 
> route on the interface and bring the interface up.

Speaking of pppol2tp, it seems /proc/net/pppol2tp is not safe,
with a strange two phases locking...

(We keep in struct pppol2tp_seq_data pointers to structures
that might have been freed between to read() syscalls)
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