From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH net-next-2.6] rtnetlink: speedup rtnl_dump_ifinfo() Date: Sat, 24 Oct 2009 06:13:29 -0700 (PDT) Message-ID: <20091024.061329.94127938.davem@davemloft.net> References: <4AE06D81.4050003@gmail.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, bcrl@lhnet.ca To: eric.dumazet@gmail.com Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:58963 "EHLO sunset.davemloft.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753333AbZJXNNG (ORCPT ); Sat, 24 Oct 2009 09:13:06 -0400 In-Reply-To: <4AE06D81.4050003@gmail.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Eric Dumazet Date: Thu, 22 Oct 2009 16:34:41 +0200 > When handling large number of netdevice, rtnl_dump_ifinfo() > is very slow because it has O(N^2) complexity. > > Instead of scanning one single list, we can use the 256 sub lists > of the dev_index hash table. > > This considerably speedups "ip link" operations > > Signed-off-by: Eric Dumazet Applied, thanks!