From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752792AbaFMNqs (ORCPT ); Fri, 13 Jun 2014 09:46:48 -0400 Received: from smtp.pobox.com ([208.72.237.35]:54637 "EHLO smtp.pobox.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752498AbaFMNqo (ORCPT ); Fri, 13 Jun 2014 09:46:44 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=pobox.com; h=message-id:date :from:mime-version:to:subject:references:in-reply-to :content-type:content-transfer-encoding; q=dns; s=sasl; b=oBLLOJ vdXU7WpCZvXCoq7pX1hkrkSdcGefUpmY0v3nH7rBfjj8LUDhAAIyJ9AVQ3BwKHvx 6mUwI2SY1Zy7q7ZiSI2bED0/dJx2CEqdZTocv2A8RVd8FT/eQxjLmlh3swU6HHre 0L0YirQyywRzcZnA8e5Ew1zKzU5/Y5DKv/WAA= Message-ID: <539B00BE.4080206@pobox.com> Date: Fri, 13 Jun 2014 14:46:38 +0100 From: Brian Candler User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Re: tap interface apparently rate-limited to 1 packet per 12ms References: <53957C85.4040700@pobox.com> In-Reply-To: <53957C85.4040700@pobox.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Pobox-Relay-ID: 25844C08-F301-11E3-A2E1-9903E9FBB39C-28021239!pb-smtp0.pobox.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org FWIW this turned out to be a silly mistake on my side. "ping -f" rate-limits its output when it's not receiving any reply packets. Using a small C program to send a burst of UDP packets, there's no delay. It appears pretty much coincidental that the ~10ms packet processing interval in dynamips is similar to the 10ms delay for ping -f sending packets (MININTERVAL) Sorry for the noise :-(