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        Kapil Chowksey <kchowksey@hss.hns.com>
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Date: Sun, 9 Nov 1997 16:38:52 -0500 (GMT)
From: Kapil Chowksey <kchowksey@hss.hns.com>
To: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: kern/4989: NE2100 ethernet card (lnc1) gives poor performance.
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>Number:         4989
>Category:       kern
>Synopsis:       NE2100 ethernet card (lnc1) gives poor performance.
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Nov  9 03:20:01 PST 1997
>Last-Modified:
>Originator:     Kapil Chowksey <kchowksey@hss.hns.com>
>Organization:
hss
>Release:        FreeBSD 2.2.5-RELEASE i386
>Environment:

FreeBSD ensatm1.hss.hns.com 2.2.5-RELEASE FreeBSD 2.2.5-RELEASE #0: Tue Oct 21
14:33:00 GMT 1997     jkh@time.cdrom.com:/usr/src/sys/compile/GENERIC  i386

>Description:

	NE2100 ethernet card (on an HP Vectra Pentium class CPU) running
	FreeBSD 2.2.5-RELEASE with 10Mbps ethernet is giving very poor
	performance (about 4 Kbps ftp transfers). This is happening only
	in post-install operation -- single user as well as multi-user mode.

	During installation (which was done in ftp mode using an ftp server
	on local ethernet), the performance was normal (about 400 Kbps ftp
	transfers).

	A tcpdump shows that FTP transfers a chunk of data, waits for 
	*two seconds*, then transfers a chunk ... and so on.

16:36:48.167449 elbereth.40051 > kchowksey.ftp-data: . ack 12960 win 17280 <nop
,nop,timestamp 9423 22459,nop,nop,[|tcp]> (DF) [tos 0x8]
16:36:48.167599 elbereth.40051 > kchowksey.ftp-data: . ack 12960 win 17280 <nop
,nop,timestamp 9423 22459,nop,nop,eol,[|tcp]> (DF) [tos 0x8]
16:36:49.641186 kchowksey.ftp-data > elbereth.40051: . 12960:14400(1440) ack 1
 win 17280 <nop,nop,timestamp 22461 9423,nop,nop,[|tcp]> (DF) [tos 0x8]
16:36:49.644203 elbereth.40051 > kchowksey.ftp-data: . ack 17280 win 12960 <nop
,nop,timestamp 9426 22461,nop,nop,eol,[|tcp]> (DF) [tos 0x8]
16:36:49.644353 elbereth.40051 > kchowksey.ftp-data: . ack 17280 win 17280 <nop
,nop,timestamp 9426 22461,nop,nop,[|tcp]> (DF) [tos 0x8]


>How-To-Repeat:

	Do a reasonably sustained ftp transfer on a NE2100 card. transfer
	rates are abyssimally low.
>Fix:
>Audit-Trail:
>Unformatted: