netdev - Re: v6: faster tree-based sysctl implementation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 7 Dec 2011 01:42:58 +0200
From:	Anca Emanuel <anca.emanuel@...il.com>
To:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
Cc:	"Eric W . Biederman" <ebiederm@...ssion.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, Octavian Purdila <tavi@...pub.ro>,
	"David S . Miller" <davem@...emloft.net>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Damien Millescamps <damien.millescamps@...nd.com>
Subject: Re: v6: faster tree-based sysctl implementation

On Tue, Dec 6, 2011 at 4:33 PM, Lucian Adrian Grijincu
<lucian.grijincu@...il.com> wrote:
> Sysctl uses a slow algorithm: O(N^2) for insertions, O(N) for lookup,
> with a relatively big constant.
> The performance is acceptable when N is small, but sometimes it can
> grow to bigger values.
> One case where N can grow to very large values is when you add network
> interfaces.
>
[snip]
>
> This algorithm is O(N * logN) for insert and O(logN) for lookup.
>
>
>> You add more code. This is not good. If you reduce the code, then it
>> will be interesting.
>
> Thank you. I know that, but it's easier said than done. I'd welcome
> some feedback in what could be simplified in my patches :)

>From an "airplane view" you can make the algorithms generic, and find
other places in kernel that can use them.
If you do that, I am sure you will get the attention.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html