From nobody  Sun Nov  9 07:06:39 1997
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Date: Sun, 9 Nov 1997 07:06:39 -0800 (PST)
From: repin@ssd.sscc.ru
To: freebsd-gnats-submit@freebsd.org
Subject: NFS hangs under FastEthernet. 1024 Bytes packet size does not help
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>Number:         4990
>Category:       kern
>Synopsis:       NFS hangs under FastEthernet. 1024 Bytes packet size does not help
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    peter
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Nov  9 07:10:00 PST 1997
>Closed-Date:    Sun Dec 12 00:00:50 PST 1999
>Last-Modified:  Sun Dec 12 00:01:16 PST 1999
>Originator:     Oleg Yu. Repin
>Release:        2.2.5-RELEASE
>Organization:
Supercomputer Software Department RAS
>Environment:
FreeBSD ssd-sscc.sscc.ru 2.2.5-RELEASE FreeBSD 2.2.5-RELEASE #0: Wed Oct 29 19:34:57 NS 1997     root@ssd-0.sscc.ru:/usr/src/sys/compile/PII  i386

>Description:
I worked under 10 Mbps Ethernet before.
Then I tried to switch to FastEthernet:

Machines:
 1. Pentium II 233 MHz, ASUS P2L97, 96 MB SDRAM, NCR UltraSCSI
 2. Pentium 150 MHz, ASUS VX97, 32 MB EDO RAM, onboard IDE
are not overclocked.

Network cards: Intel EtherExpress PRO/100B PCI
Hub: IntelExpress 100BASE-TX

I discovered that NFS hangs while mounting disk from
high end machine.
I tried to change packet size (512, 1K, 8K, 16K) but
it has not effect.
The only success - switching to TCP (-T option of mount_nfs),
but NFS still eventually hangs.
One sertain case it happens: if I turn off and then turn on
NFS server, NFS client hangs. But it can hang in other cases.
Current mount options: bg,intr,-T,-r=8192,-w=8192

>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->peter 
Responsible-Changed-By: peter 
Responsible-Changed-When: Sat Apr 25 22:40:57 PDT 1998 
Responsible-Changed-Why:  
i'll take a look at this.. 
State-Changed-From-To: open->closed 
State-Changed-By: dillon 
State-Changed-When: Sun Dec 12 00:00:50 PST 1999 
State-Changed-Why:  
We believe we have fixed the NFS hanging bugs in later kernels (3.x and 4.x), 
for both UDP and TCP mounts. 
>Unformatted:
