From owner-freebsd-hackers Tue Dec 23 21:02:17 1997 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.7/8.8.7) id VAA10070 for hackers-outgoing; Tue, 23 Dec 1997 21:02:17 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from tapti.hss.hns.com (tapti.hss.hns.com [139.85.242.19]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id VAA10061 for ; Tue, 23 Dec 1997 21:01:51 -0800 (PST) (envelope-from kchowksey@hss.hns.com) Received: from tarang.hss.hns.com (tarang.hss.hns.com [139.85.242.33]) by tapti.hss.hns.com (8.8.2/8.7.3) with ESMTP id KAA12621; Wed, 24 Dec 1997 10:28:58 +0500 (IST) Received: (from kchowksey@localhost) by tarang.hss.hns.com (8.8.2/8.7.3) id KAA17065; Wed, 24 Dec 1997 10:26:26 -0500 (GMT) Date: Wed, 24 Dec 1997 10:26:26 -0500 (GMT) Message-Id: <199712241526.KAA17065@tarang.hss.hns.com> From: Kapil Chowksey MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit To: dh2@netwalk.com CC: hackers@FreeBSD.ORG Subject: Re: (?) lnc0: Transmit underflow error -- Resetting In-Reply-To: <19971223230921.57532@netwalk.com> References: <19971223230921.57532@netwalk.com> X-Mailer: VM 6.34 under Emacs 19.34.1 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk On Tue, 23 December, dh2@netwalk.com wrote: > I'm trying to do transfers of a large amount of data between my FreeBSD > 3.0-971208-SNAP box with a NE2100 Lance card and a Linux 2.0.32 box with an > NE2000. > > My effective transfer rate is measely 1.6kbytes per second over a 10Mbps > ethernet with FTP, and I'm getting loads of these in the FreeBSD error log: Ditto here. I have a PCI based NE2100 card (lnc1) on an HP Vectra pentium 200Mhz class PC which gives equally pathetic performance (both under 2.2.5-RELEASE and 3.0-971208-SNAP) while ftp'ing to any other host (Solaris, HPUX, EtherExpress Linux's, ed0 based FreeBSDs). It seems that packet sizes greater than 738 get delayed by 1-2 seconds in the driver itself ! elbereth# ping -f -s 738 luthien PING luthien.hss.hns.com (139.85.242.7): 738 data bytes . but, elbereth# ping -f -s 739 luthien PING luthien.hss.hns.com (139.85.242.7): 738 data bytes ................................................ elbereth# netstat -ni Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll lnc1 1500 00.60.b0.5b.74.c6 389811 0 102696 0 1258 Nothing abnormal here. I think the driver slows down while transmitting IP packets of sizes greater than 738 (ICMP data) + 8 (ICMP header) + 20 (IP Header) = 766 bytes > /kernel: lnc0: Transmit underflow error -- Resetting I am not getting any messages from lnc driver however. Is there a maintainer for lnc driver currently ? sincerely, -- Kapil Chowksey "Modularity is not a hack." kchowksey@hss.hns.com -- D. J. Bernstein