From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailgw7.ericsson.se (mailgw7.ericsson.se [193.180.251.48]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mailgw7.ericsson.se", Issuer "VeriSign Class 3 Secure Server CA - G2" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 963F9208AD1 for ; Mon, 19 Nov 2012 02:27:29 -0800 (PST) X-AuditID: c1b4fb30-b7f936d0000018b3-dd-50aa098dc33f Received: from esessmw0197.eemea.ericsson.se (Unknown_Domain [153.88.253.124]) by mailgw7.ericsson.se (Symantec Mail Security) with SMTP id 37.99.06323.D890AA05; Mon, 19 Nov 2012 11:27:26 +0100 (CET) Received: from ESESSHC020.ericsson.se (153.88.183.78) by esessmw0197.eemea.ericsson.se (153.88.115.87) with Microsoft SMTP Server (TLS) id 8.3.279.1; Mon, 19 Nov 2012 11:27:25 +0100 Received: from ESESSMB205.ericsson.se ([169.254.5.136]) by ESESSHC020.ericsson.se ([153.88.183.78]) with mapi id 14.02.0318.001; Mon, 19 Nov 2012 11:27:25 +0100 From: Ingemar Johansson S To: "bloat@lists.bufferbloat.net" Thread-Topic: Skype Thread-Index: Ac3GP86nKrbxSPwhSeydPLPbM5M0Gg== Date: Mon, 19 Nov 2012 10:27:24 +0000 Message-ID: <81564C0D7D4D2A4B9A86C8C7404A13DA04B32E@ESESSMB205.ericsson.se> Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [153.88.183.18] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrKLMWRmVeSWpSXmKPExsUyM+JvjW4f56oAg0k7eSwmzNnLYtH/6z6r xY+zO1kdmD1Wr37I7LH94hkmj1mzDjMFMEdx2aSk5mSWpRbp2yVwZbz/8pK54LVcxbeuj4wN jFMkuxg5OCQETCRevnbvYuQEMsUkLtxbz9bFyMUhJHCSUaJ71WVGkISQwE5GifVXDSESSxgl Grf9YwdJsAnYSKw89B2sSETAXmL6+lNgcWaBGIltu1qYQGxhASGJhq5NrBA1whKr9n5iBVks IqAnseRhBUiYRUBV4tm6o2CtvALeEk1X14LZjAKyEve/32OBGCkucevJfCaIQwUkluw5zwxh i0q8fPyPFcJWlPj4ah8jRL2OxILdn9ggbG2JZQtfM0PMF5Q4OfMJC8RfuhLrd1xln8AoNgvJ illI2mchaZ+FpH0BI8sqRvbcxMyc9HLzTYzAqDm45bfBDsZN98UOMUpzsCiJ8+qp7vcXEkhP LEnNTk0tSC2KLyrNSS0+xMjEwSnVwKhl/I03hfus7rz0nGk/I7r12q9m7+sJjvhWvLju3Q3+ x8+rbug8EtypmPPrOb/YggU8FjEusrGX920p0WeTKdTcuvz/reuhpWxhul8lVFQL+farvC1O qS74VCJe+DH2/L3JW3yYS1hNCrc5VQv3d65a+kDGZvt2g8lrHh5v3+AVfy9kQ6uKlhJLcUai oRZzUXEiAPKHkPhoAgAA Subject: Re: [Bloat] Skype 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: Mon, 19 Nov 2012 10:27:30 -0000 Hi Been a year or so since I read about the inner secrets of Skype so this may= be old.. I would suspect that your Skype session runs over TCP (via a Relay). This m= ay happen e.g when a firewall blocks UDP.=20 TCP (possibly in combination with a lossy WiFi connection) is what creates = the high latencies.=20 /Ingemar ------------------------------ Message: 2 Date: Sun, 18 Nov 2012 15:57:53 +0100 From: Michael Welzl To: bloat Subject: [Bloat] Skype Message-ID: <647D57F5-24CE-4006-AD2A-74141C84C3CB@ifi.uio.no> Content-Type: text/plain; charset=3DUS-ASCII; format=3Dflowed; delsp=3Dyes Hi, I have repeatedly noticed that Skype sometimes, in a long conversation invo= lving video, can create massive audio delays (in the order of multiple seco= nds). This has happened to me in a conversation from a hotel room in the US= to my home in Oslo (where, apologies, I haven't yet looked into de-bloatin= g my modem and access point), and from my office in Oslo to someone else's = office in the US. I'm wondering: was that always due to bloated equipment along the path (inc= luding the end hosts), or does Skype poorly handle its internal buffers? Any experiences? I suppose the way to find out is to run Skype over a verif= iably de-bloated path. If, then, the problem never occurs, the fault is wit= h the equipment and not with Skype (and vice versa). Cheers, Michael ------------------------------ Message: 3 Date: Sun, 18 Nov 2012 08:09:03 -0800 (PST) From: Alex Burr To: bloat Subject: Re: [Bloat] Skype Message-ID: <1353254943.93761.YahooMailNeo@web126202.mail.ne1.yahoo.com> Content-Type: text/plain; charset=3Dus-ascii I have noticed delays - although I don't think multiple seconds - but I thi= nk that it may be skype trying to make the best of a bad connection. I don'= t have any knowledge of the internals of the skype client, but I suspect th= at they take the view that delayed audio is better than incomprehensible au= dio - I think I have even heard it actually repeating the last bit of audio= before a glitch, to give you a better chance to understand the next bit, a= nd presumably catching up when the opportunity arises.=20 So, an experiment to rule out skype might need to use not just a de-bloated= path, but one with known packet loss. Alex ----- Original Message ----- > From: Michael Welzl > To: bloat > Cc:=20 > Sent: Sunday, November 18, 2012 2:57 PM > Subject: [Bloat] Skype >=20 > Hi, >=20 > I have repeatedly noticed that Skype sometimes, in a long conversation=20 > involving video, can create massive audio delays (in the order of=20 > multiple seconds). This has happened to me in a conversation from a=20 > hotel room in the US to my home in Oslo (where, apologies, I haven't=20 > yet looked into de-bloating my modem and access point), and from my=20 > office in Oslo to someone else's office in the US. >=20 > I'm wondering: was that always due to bloated equipment along the path=20 > (including the end hosts), or does Skype poorly handle its internal buffe= rs? >=20 > Any experiences? I suppose the way to find out is to run Skype over a=20 > verifiably de-bloated path. If, then, the problem never occurs, the=20 > fault is with the equipment and not with Skype (and vice versa). >=20 > Cheers, > Michael >=20 > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat >=20 ------------------------------ _______________________________________________ Bloat mailing list Bloat@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/bloat End of Bloat Digest, Vol 23, Issue 10 *************************************