From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cassarossa.samfundet.no (cassarossa.samfundet.no [IPv6:2001:67c:29f4::29]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 748B421F25D for ; Fri, 21 Mar 2014 09:42:22 -0700 (PDT) Received: from pannekake.samfundet.no ([2001:67c:29f4::50] ident=unknown) by cassarossa.samfundet.no with esmtps (TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1WR2WQ-00009g-KJ for bloat@lists.bufferbloat.net; Fri, 21 Mar 2014 17:42:19 +0100 Received: from sesse by pannekake.samfundet.no with local (Exim 4.80) (envelope-from ) id 1WR2WQ-0003Xm-91 for bloat@lists.bufferbloat.net; Fri, 21 Mar 2014 17:42:18 +0100 Date: Fri, 21 Mar 2014 17:42:18 +0100 From: "Steinar H. Gunderson" To: bloat@lists.bufferbloat.net Message-ID: <20140321164218.GA9261@sesse.net> References: <20140318145221.GA31327@sesse.net> <07BD4518-2A7E-4F43-8978-791E3B2BDA2A@cisco.com> <87eh1wc05c.fsf@toke.dk> <87a9ckbz1q.fsf@toke.dk> <871txvbre7.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Operating-System: Linux 3.13.3 on a x86_64 User-Agent: Mutt/1.5.21 (2010-09-15) Subject: Re: [Bloat] AQM creeping into L2 equipment X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Mar 2014 16:42:22 -0000 On Fri, Mar 21, 2014 at 03:39:16PM +0000, Dave Taht wrote: >>> Is your hardware fast enough to run tcpdump -s 128 -w whatever.cap -i >>> your interface during an entire rrul test without dropping packets? >>> (on client and server) > (question to list) Are there any options to tcpdump or the kernel to > make it more possible to capture full packet payloads (64k) without > loss at these speeds? tshark? You can capture tens of gigabits of traffic if you use the mmap packet ring stuff. Doubt tcpdump supports it, but it wouldn't be impossible to do. I'm a bit confused if a normal machine these days can't easily saturate gigabit (and capture it to SSD without further problems), though. /* Steinar */ -- Homepage: http://www.sesse.net/