Date: Wed, 24 Dec 1997 10:26:26 -0500 (GMT) From: Kapil Chowksey <kchowksey@hss.hns.com> To: dh2@netwalk.com Cc: hackers@FreeBSD.ORG Subject: Re: (?) lnc0: Transmit underflow error -- Resetting Message-ID: <199712241526.KAA17065@tarang.hss.hns.com> In-Reply-To: <19971223230921.57532@netwalk.com> References: <19971223230921.57532@netwalk.com>
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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 <Link> 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
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