From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ie0-x235.google.com (mail-ie0-x235.google.com [IPv6:2607:f8b0:4001:c03::235]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id CF56521F1F2 for ; Fri, 22 Mar 2013 06:31:35 -0700 (PDT) Received: by mail-ie0-f181.google.com with SMTP id 17so4815168iea.12 for ; Fri, 22 Mar 2013 06:31:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:content-transfer-encoding; bh=n2jqGWzhH9ecVZIqVqFPzH7x8Kh3j2sldc6MLAblHh8=; b=toE3F90kIeGpSdJeXf6FJ0XkIlvK5iyB3TEcGPmAT4XfQy4568JkBjcLbnwVHS3zHQ bu8TRfaQXaR3vrGHq/+DzNEsyS+XJglRaOrmLskQvik1am+4OzafPhP3plaEsqcOiWQs Wqa+u5R2TqHHXfyqRFk1K6QSJ3u8shs8csNoV3Gn4U2T7n6TWpc1X1FdaWGVvkdZvH+J 3NCT8vpVhQkNyV2G4l1VP9CUMpM6seHdlRlGz6AWGgOer5uJvZ61neMHKmTkotsJbvSZ OTyFTcIreYein1qQzV1t5C5z0nZFkx/itpeyovDqoGF0GkuGTVc4Bc3FZ0gCf/OwpwrE yOEg== MIME-Version: 1.0 X-Received: by 10.50.196.234 with SMTP id ip10mr1178662igc.27.1363959095143; Fri, 22 Mar 2013 06:31:35 -0700 (PDT) Received: by 10.64.132.71 with HTTP; Fri, 22 Mar 2013 06:31:35 -0700 (PDT) In-Reply-To: References: <51408BF4.7090304@cisco.com> <514B5AC8.8000502@net.t-labs.tu-berlin.de> <514BF37D.2080000@swin.edu.au> Date: Fri, 22 Mar 2013 06:31:35 -0700 Message-ID: From: Dave Taht To: Mikael Abrahamsson Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: bloat , aqm@ietf.org, "tsvwg@ietf.org" Subject: Re: [Bloat] [aqm] [tsvwg] how much of a problem is buffer bloat today? 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, 22 Mar 2013 13:31:36 -0000 On Fri, Mar 22, 2013 at 6:23 AM, Mikael Abrahamsson wrot= e: > On Fri, 22 Mar 2013, grenville armitage wrote: > >> >> >> On 03/22/2013 15:27, Mikael Abrahamsson wrote: >> [..] >>> >>> I am not aware of any such work going on, so I'd like to know if >>> anyone else is aware of work in this area? >> >> >> Of possible relevance, recent FreeBSDs have SIFTR -- a kernel resident >> module for collecting TCP state-machine stats (like cwnd, rtt estimator, >> etc) as packets arrive and depart. >> >> http://www.freebsd.org/cgi/man.cgi?query=3Dsiftr > > > This seems exactly like what I'm after. > > On another note, is there software that can get mirrored traffic from > another host and do TCP analysis of flows when it comes to buffer bloat, > packet loss etc. If there was, I am in the position of running this again= st > a large number of customers over time and can present the results. http://web10g.org/ and ihttp://www.web100.org/ are also potentially very useful. My concern with this used to be that it gets it's fingers into the tcp hot path, but in practice modern gear is so fast it's hard to notice. I used to patch this into cerowrt but it was hard to keep the patches in sync with the linux mainline code I was also tracking. Might consider adding it again, but in the general case it seems more useful on the end points than elsewhere (my use case was against the local test suites on cero and on the polipo web proxy resident on the router) > > > -- > Mikael Abrahamsson email: swmike@swm.pp.se > _______________________________________________ > aqm mailing list > aqm@ietf.org > https://www.ietf.org/mailman/listinfo/aqm --=20 Dave T=E4ht Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.= html