From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qc0-x231.google.com (mail-qc0-x231.google.com [IPv6:2607:f8b0:400d:c01::231]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 9F08321F201 for ; Sun, 19 Apr 2015 14:58:00 -0700 (PDT) Received: by qcbii10 with SMTP id ii10so49576493qcb.2 for ; Sun, 19 Apr 2015 14:57:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=content-type:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=KSc2mMID1RzNCXuEzYL2fz+AJy6WPyD5EaxiZJEsZMs=; b=kbsDEfJwvkdSxTiNBsl7/4+emv2tsdDpTMadwl44+j0F2BtKTrcZRA+xLjACrIiCPg YwFhDeU46DvMXgy514r2jg9HYMunRYopRlkGqRlZ++anpGvSEZEDnp2TVVQ2B6FF9aLd Ju40woIwNNsXfu/yMQ5ayZwD9+vfdIoLGZwZdLzR9JIZLFp+9nLdoedN/MBQeD0ZpP0Y OQMrKrtykLXusqfi7LYEGVBsSE5gRO4d5CetHg4nm8FKBZUsA2T+ucd9yylHMcqaMWqh QUGq6Y8trTL3DfpFldjl18I84vjMH7TtXAzV9Gg+rSwoSczWZh+mH5tEE2rFWzKf3mKA 3DMA== X-Received: by 10.55.22.222 with SMTP id 91mr23444601qkw.101.1429480678977; Sun, 19 Apr 2015 14:57:58 -0700 (PDT) Received: from richs-mbp-11726.home.lan (pool-71-241-215-163.port.east.myfairpoint.net. [71.241.215.163]) by mx.google.com with ESMTPSA id f8sm13021103qka.9.2015.04.19.14.57.57 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sun, 19 Apr 2015 14:57:58 -0700 (PDT) Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) From: Rich Brown In-Reply-To: Date: Sun, 19 Apr 2015 17:57:56 -0400 Content-Transfer-Encoding: quoted-printable Message-Id: References: <87wq18jmak.fsf@toke.dk> <87oamkjfhf.fsf@toke.dk> <87k2x8jcnw.fsf@toke.dk> To: Mikael Abrahamsson X-Mailer: Apple Mail (2.1878.6) Cc: bloat Subject: Re: [Bloat] DSLReports Speed Test has latency measurement built-in 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: Sun, 19 Apr 2015 21:58:28 -0000 Hi folks, A couple comments re: the DSLReports Speed Test. 1) It's just becoming daylight for Justin, so he hasn't had a chance to = respond to all these notes. :-) 2) In a private note earlier this week, he mentioned that he uses = "websocket pings" which he believes are pretty speedy/low latency. 3) He does have plans to incorporate stats from the server end's TCP = stack (cwnd, packet loss, retransmissions, etc.) in a future version of = the speed test. I imagine it would help him to know what you'd like to = see... Best, Rich On Apr 19, 2015, at 1:15 PM, Mikael Abrahamsson = wrote: > On Sun, 19 Apr 2015, Toke H=F8iland-J=F8rgensen wrote: >=20 >> The upload latency figures are definitely iffy, but the download ones = seem to match roughly what I've measured myself on this link. >=20 > Also, I don't trust parallel latency measures done by for instance = ICMP ping. Yes, they indicate something, but what? >=20 > We need insight into the TCP stack. So how can an application like = dslresports that runs in a browser, get meaningful performance metrics = on its measurement TCP-sessions from the OS TCP stack? This is a = multi-layer problem and I don't see any meaningful progress in this = area... >=20 > --=20 > Mikael Abrahamsson email: = swmike@swm.pp.se_______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat