From owner-freebsd-hackers@FreeBSD.ORG Thu Sep 18 12:25:38 2003 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D2DAD16A4B3 for ; Thu, 18 Sep 2003 12:25:38 -0700 (PDT) Received: from mtiwmhc13.worldnet.att.net (mtiwmhc13.worldnet.att.net [204.127.131.117]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7C24543FAF for ; Thu, 18 Sep 2003 12:25:37 -0700 (PDT) (envelope-from cmascott@att.net) Received: from callisto.local (203.cambridge-02rh15rt.ma.dial-access.att.net[12.91.18.203]) by mtiwmhc13.worldnet.att.net (mtiwmhc13) with ESMTP id <2003091819253511300s74tfe>; Thu, 18 Sep 2003 19:25:35 +0000 Received: from callisto.local (localhost.local [127.0.0.1]) by callisto.local (8.12.8p1/8.12.8) with ESMTP id h8IJPWm2000248 for ; Thu, 18 Sep 2003 15:25:32 -0400 (EDT) (envelope-from cmascott@callisto.local) Received: (from cmascott@localhost) by callisto.local (8.12.8p1/8.12.8/Submit) id h8IJPVBB000247 for freebsd-hackers@freebsd.org; Thu, 18 Sep 2003 15:25:31 -0400 (EDT) Date: Thu, 18 Sep 2003 15:25:31 -0400 (EDT) From: Carl Mascott Message-Id: <200309181925.h8IJPVBB000247@callisto.local> To: freebsd-hackers@freebsd.org Subject: 4.8-R: strange hitch in user ppp Rx data flow X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Sep 2003 19:25:39 -0000 FreeBSD 4.8-R user ppp P II - 400 128 MB RAM 56K ext. modem, 45.3K connection When I updated from 4.3-R to 4.8-R recently I immediately noticed a strange hitch in the flow of received data from user ppp to TCP/IP applications. For example, with the BSD ftp client, when receiving a file, the progress always stops around 113 KB and ftp reports "stalled" for about 10 seconds. Then the ftp client suddenly shows 170 KB received and for the rest of the transfer there are no more hitches. This is 100% repeatable. During the 10 seconds when ftp's progress is "stalled" at 113 KB the RxD LED on my external modem shows continuous data flow. Both Netscape and Opera show the same hitch under 4.8-R. I tried transferring a large (40 MB) file across my 10 Mb/s LAN several times with the ftp client and never saw any pauses. 4.3-R definitely did not do this. Anybody got any ideas? I've already tried the 4.3-R ppp binary on 4.8-R: same behavior.