Date: Thu, 03 Jun 1999 22:26:45 +0900 From: Changhoon Kim <kimch@etri.re.kr> To: FreeBSD Net <net@FreeBSD.ORG> Subject: Problematic behavior of FTPD or Fast Ethernet Driver ... Message-ID: <37568294.1AF6876E@etri.re.kr>
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Hello, folks !
I have a network which can be simply modelized into a diagram below.
+----+
(A) --------- | |
|HUB|--------(C)==========<D>
[B]--------- | |
+-- -+
(A) and (C) is FreeBSD 3.1, <D> is Redhat Linux 6.0, and (B) is Windows
98 machine respectively. Lines denoted as "---------" are Fast Ethernet,
and the other line denoted as "========" is ATM 155M PVC. Therefore, (C)
has two NICs, one is for Fast Ethernet, and the other is Fore's PCA-200E
ATM PCI NIC.
Of course, the HUB is capable of transmitting packets at up to 100 Mbps.
It has been observed that user can transfer files at about 40 Mbps from
[B] to <D> by means of FTP. During this process, (C) plays a role of
router. Therefore, It seem like that (C) does not access HDD during this
process.
However, file transfer speed between (C) to (A) could NOT surpass 0.3
Mbps when the two end points of the FTP process are (A) and (C).
Meanwhile, [B] - Win98 host - could transfer files at about 20 Mbps or
over between (C) and itself.
Isn't this situation problematic ?
Any good remedis for this unreasonable situation of host (C) and (A) ?
Where is the origin of this abnormal behavior ? FTPD, Fast Ethernet
Driver, or TCP/IP stack implementation ?
I'm using SMC's EZ 1211 Fast Ethernet card. and the physical device name
detected by FreeBSD kernel is "rl0". But, I have no idea about this card
has some relation with RealTek chipset ...
Wish your replies. TIA !
--
==========================================================
Changhoon Kim
Internet Technology Research Dept. Switching & Transmission Technology
Lab.
Electronics and Telecommunications Research Institute(ETRI)
161 Kajong-dong, Yusong-gu, Taejon, 305-350, KOREA
Tel: (Office) +82-42-860-5801, (Cell) +82-19-226-6305
E-mail: kimch@etri.re.kr
* All Smiles, Everywhere and Everytime !
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