From owner-freebsd-net@FreeBSD.ORG Sat Mar 22 05:37:14 2008 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id F1ACD106566B for ; Sat, 22 Mar 2008 05:37:14 +0000 (UTC) (envelope-from pyunyh@gmail.com) Received: from wf-out-1314.google.com (wf-out-1314.google.com [209.85.200.170]) by mx1.freebsd.org (Postfix) with ESMTP id CB3758FC15 for ; Sat, 22 Mar 2008 05:37:14 +0000 (UTC) (envelope-from pyunyh@gmail.com) Received: by wf-out-1314.google.com with SMTP id 25so1926564wfa.7 for ; Fri, 21 Mar 2008 22:37:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:received:received:date:from:to:cc:subject:message-id:reply-to:references:mime-version:content-type:content-disposition:in-reply-to:user-agent; bh=bMg/rIdzSt1Zgaka2ZgszOYK8AZ0O0Z8DhPxjsD232M=; b=jBv4cC3OywQ8fAx6E3lMBQIwxRpWYzw99/GCqbSWZ4dalU4TUmYGHgR3pZwMWUDhaLROlcaa40RIPmfuLIg8Jvy6hiB7f+N/47mexrmhYJuloD16ONiWo2lXIIEX4yOnP0jgOGdFouoRnoU2jjd14sQxcFrC0NyUZ8jPWgGF0Uo= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=date:from:to:cc:subject:message-id:reply-to:references:mime-version:content-type:content-disposition:in-reply-to:user-agent; b=Tc0xdfkj38pxtyOJ+EaedfhUn/2hoHuWmrgz/IlYI/H2q1ZrGa2o0jaDchirq5fAp7k02o+lV9Wv2hQCbasknON6BKhXYMHPPuyPTkGlVdBgnkpnqBAtKbU3KXyFHGKkv9ka6yvZYB9O6TmLVM3WAKkD7shmGcqQAabl76kW+FE= Received: by 10.142.83.4 with SMTP id g4mr2913960wfb.103.1206164234306; Fri, 21 Mar 2008 22:37:14 -0700 (PDT) Received: from michelle.cdnetworks.co.kr ( [211.53.35.84]) by mx.google.com with ESMTPS id 22sm8822738wfi.12.2008.03.21.22.37.11 (version=TLSv1/SSLv3 cipher=OTHER); Fri, 21 Mar 2008 22:37:13 -0700 (PDT) Received: from michelle.cdnetworks.co.kr (localhost.cdnetworks.co.kr [127.0.0.1]) by michelle.cdnetworks.co.kr (8.13.5/8.13.5) with ESMTP id m2M5b8tl075507 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sat, 22 Mar 2008 14:37:08 +0900 (KST) (envelope-from pyunyh@gmail.com) Received: (from yongari@localhost) by michelle.cdnetworks.co.kr (8.13.5/8.13.5/Submit) id m2M5b69w075506; Sat, 22 Mar 2008 14:37:06 +0900 (KST) (envelope-from pyunyh@gmail.com) Date: Sat, 22 Mar 2008 14:37:06 +0900 From: Pyun YongHyeon To: Giulio Ferro Message-ID: <20080322053706.GC74996@cdnetworks.co.kr> References: <20080314001704.GA22788@cdnetworks.co.kr> <47DA4DCD.6050304@zirakzigil.org> <20080314101555.GF22788@cdnetworks.co.kr> <47DA682E.9010504@zirakzigil.org> <20080314122708.GG22788@cdnetworks.co.kr> <47DA9BC0.8030205@zirakzigil.org> <20080317043945.GA2503@cdnetworks.co.kr> <47E298BD.7050807@zirakzigil.org> <20080320235420.GA70708@cdnetworks.co.kr> <47E3B7F8.40307@zirakzigil.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <47E3B7F8.40307@zirakzigil.org> User-Agent: Mutt/1.4.2.1i Cc: Andrew Thompson , freebsd-net@freebsd.org Subject: Re: VLAN trunking and fragmentation X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: pyunyh@gmail.com List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 Mar 2008 05:37:15 -0000 On Fri, Mar 21, 2008 at 02:28:24PM +0100, Giulio Ferro wrote: > Pyun YongHyeon wrote: > > > > > > # ping -s 2000 192.168.100.2 > > > PING 192.168.100.2 (192.168.100.2): 2000 data bytes > > > 2008 bytes from 192.168.100.2: icmp_seq=0 ttl=64 time=0.264 ms > > > 2008 bytes from 192.168.100.2: icmp_seq=1 ttl=64 time=1001.186 ms > > > >[...] > > > > > 2008 bytes from 192.168.100.2: icmp_seq=41 ttl=64 time=0.181 ms > > > > > > > > > > > > It would be great if you could understand why this happens... > > > > > > >Try set tunable hw.re.msi_disable and let me know how it goes. > >(Add hw.re.msi_disable="1" to /boot/loader.conf) > > > > > You're spot on! > > ---------------------------------- > # ping -c 200 -s 1472 192.168.100.2 > PING 192.168.100.2 (192.168.100.2): 1472 data bytes > 1480 bytes from 192.168.100.2: icmp_seq=0 ttl=64 time=0.192 ms > 1480 bytes from 192.168.100.2: icmp_seq=1 ttl=64 time=0.151 ms > 1480 bytes from 192.168.100.2: icmp_seq=2 ttl=64 time=0.155 ms > 1480 bytes from 192.168.100.2: icmp_seq=3 ttl=64 time=0.150 ms > 1480 bytes from 192.168.100.2: icmp_seq=4 ttl=64 time=0.151 ms > 1480 bytes from 192.168.100.2: icmp_seq=5 ttl=64 time=0.149 ms > 1480 bytes from 192.168.100.2: icmp_seq=6 ttl=64 time=0.153 ms > 1480 bytes from 192.168.100.2: icmp_seq=7 ttl=64 time=0.149 ms > [...] > --- 192.168.100.2 ping statistics --- > 200 packets transmitted, 200 packets received, 0.0% packet loss > round-trip min/avg/max/stddev = 0.148/0.159/1.472/0.093 ms > ---------------------------------- > > What does that tunable do? > That tunable disables the use of MSI which is believed to be preferred way to deliver interrtups on recent hardwares that supports MSI. But it seems that some variants of RealTek hardware doesn't seem to work correctly with MSI. -- Regards, Pyun YongHyeon