From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ie0-x236.google.com (mail-ie0-x236.google.com [IPv6:2607:f8b0:4001:c03::236]) (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 E371121F1E6 for ; Wed, 19 Jun 2013 14:27:01 -0700 (PDT) Received: by mail-ie0-f182.google.com with SMTP id s9so14802747iec.27 for ; Wed, 19 Jun 2013 14:27:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=x4JytxMUdS19SWJXp3mtiJ5B47h8DRw1Doo1A5yFNwk=; b=L4e8MqBLl7jxrdnY+SK1tKmiqNLxnWyptY0DosOySNPiMgOdEWSenuJLOJjYNjAi8u 1dINkODDdREPCxTEOT9PKd7Gt4PVQObpnJzZibEnjQcL+PWFJypL0Y1LjIr1h+GMNI++ AbAepq4JM+t9jieUuoJAXeqbOtFyIgrxRmA5u8rflnbG3ifZtJfZsECMBfCOM3nBFtMb FVSCBaP6qSAVgpgTpMRTCWzFyR+5s2YF19RMwahuWk6NkI9bshTK/qB3Q/i/drELapIc +zTiOKvCCmYG7f/9n1I/bKREpQguqMw/ZuWBor2eX3Gr6JZPtWrvs6lUdt4peVsSz3eH yfzg== MIME-Version: 1.0 X-Received: by 10.50.36.100 with SMTP id p4mr11210580igj.30.1371677220592; Wed, 19 Jun 2013 14:27:00 -0700 (PDT) Received: by 10.64.45.137 with HTTP; Wed, 19 Jun 2013 14:27:00 -0700 (PDT) Date: Wed, 19 Jun 2013 14:27:00 -0700 Message-ID: From: Dave Taht To: bloat Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Subject: [Bloat] low latency workshop 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: Wed, 19 Jun 2013 21:27:02 -0000 I was trying to find the isoc/rite low latency workshop info via google today and stumbled across a competing event in london and a whole website dedicated to the latency issues in the trading industry. This talk http://low-latency.com/audio/london-low-latency-summit-2013-workshop-low-la= tency-application-engineering had slide 18 showing the enormous improvement in from-userspace timestamp fetching behavior in linux - from 637ns for CLOCK_REALTIME in 2.6.27, to 35ns in linux 3.5.4... Based on some old scars I was leery of using timestamping in userspace for some tasks. No longer. There are also some boards that look useful for analyzing hard networking stuff in detail mentioned. --=20 Dave T=E4ht Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.= html