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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
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Subject: kern/4990: 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:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Nov  9 07:10:00 PST 1997
>Last-Modified:
>Originator:     Oleg Yu. Repin
>Organization:
Supercomputer Software Department RAS
>Release:        2.2.5-RELEASE
>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:

>Audit-Trail:
>Unformatted: