linux-kernel - Re: [RFC Patch] net: reserve ports for applications using fixed port numbers

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Message-Id: <20100204.102113.267879565.davem@davemloft.net>
Date:	Thu, 04 Feb 2010 10:21:13 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	opurdila@...acom.com
Cc:	amwang@...hat.com, linux-kernel@...r.kernel.org,
	eric.dumazet@...il.com, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, nhorman@...driver.com,
	linux-sctp@...r.kernel.org
Subject: Re: [RFC Patch] net: reserve ports for applications using fixed
 port numbers

From: Octavian Purdila <opurdila@...acom.com>
Date: Thu, 4 Feb 2010 20:15:51 +0200

> int inet_is_reserved_local_port(int port)
> {
> 	if (test_bit(port, reserved_ports))
> 		return 1;
> 	return 0;
> }
> 
> In theory it might be slower because of the reserved_ports bitmap will have a 
> larger memory footprint than just a min/max, especially with random port 
> allocation. But is this an issue in practice?

No need to speculate, some simple benchmarks would confirm or deny
this.
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