Subject: Re: pcmcia ep0 performance awful in 1.6/-current
To: Nathan J. Williams <>
From: Greywolf <>
List: current-users
Date: 07/09/2002 13:26:29
This might be related somehow, I don't know.

OS:	NetBSD/sparc 1.5ZC
Hardware:  SPARCstation 5/170MHz.
Networking:	le0 [10BT]
		be0 [100TXd]
		hme0 [100TX]
Comment:  Gods, I love my hme card.

Other:  Hawking 8-port N-way switch [very small switch].
	Netopia 8-port 10BT R3100-I

Results as soon as I switched to the hawking from using the Netopia's
built-in 10baseT hub:

	NFS default size	NFS [rw]size=8192

le0	Stopped working		Worked fine
be0	Does not work at all	Does not work at all - no networking
hme0	Works fine		Works fine

I'm wondering what was wrong with le0 and the 32k I/O size.  Watching
the traffic showed a VERY SLOW snd/ack sequence.  It was on the order
of SND/ACK...[wait about 30 seconds]ACK...[wait ...]ACK [received!  yay!]

and like that.  Needless to say, I was less than thrilled at having to
reboot my box because at 1.5k/minute, I wasn't going to be able to save
that 1.2MB file any time soon...

I have NO clue as to what was up.

On 9 Jul 2002, Nathan J. Williams wrote:

# Date: 09 Jul 2002 12:02:25 -0400
# From: Nathan J. Williams <>
# To: Ben Harris <>
# Cc:
# Subject: Re: pcmcia ep0 performance awful in 1.6/-current
# Ben Harris <> writes:
# > Hmm.  What does "netstat -p ip" have to say about incoming fragments
# > (especially dropped after timeout vs received)?  It sounds as if the network
# > card is losing fragments, which usually means its receive buffer is too
# > small.
# 8747 fragments received, 0 fragments dropped (with -r and -w set to
# 4096). I don't want to wedge the machine remotely to test the other
# configuration, so that'll have to wait.
# >
# > >Server is a 1.5ZC Alpha pc164 with a tlp0 set to 100baseTX-FDX, and
# > >there's a little 5-port 10/100 switch between them.
# >
# > What speed is ep0 running at?  If it's at 10 Mbit/s, I wonder how much
# > buffering the switch has.
# Yes, it's running at 10 Mbit/s, half-duplex. The switch is a GigaFast
# EZ500-S, if that tells you anything.
#         - Nathan

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