linux-kernel - Re: regression: sysctl_check changes in 2.6.24 are O(n) resulting in slow creation of 10000 network interfaces

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Message-ID: <p73wsqlqsa9.fsf@bingen.suse.de>
Date:	Mon, 07 Jan 2008 21:45:02 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	David Miller <davem@...emloft.net>
Cc:	ebiederm@...ssion.com, bcrl@...ck.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: regression: sysctl_check changes in 2.6.24 are O(n) resulting in slow creation of 10000 network interfaces

David Miller <davem@...emloft.net> writes:
>
>> So is this a bug report telling me that there are users with
>> 10k or 100k interfaces that care.  So we need to fix sysctl.
>
> Unquestionably, we do, it's a major regression.
>
> People create thousands of VLAN devices, as one of many examples, all
> the time.

It might be an reasonable option to just stop creating sysctl entries
for interfaces after some threshold. I presume people who have that
many interfaces will mostly work through {default,all}/* anyways.

I think that would be a better option than to complicate sysctl.c
for this uncommon case.

-Andi
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