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Date: Sat, 5 May 2012 11:09:51 +0700 (NOVT)
From: Eugene Grosbein <egrosbein@rdtc.ru>
To: FreeBSD-gnats-submit@freebsd.org
Cc:
Subject: IP fragment reassembly's broken: file transfer over NFSv3/UDP fails for default NFS packet size
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>Number:         167603
>Category:       kern
>Synopsis:       [ip] IP fragment reassembly's broken: file transfer over NFSv3/UDP fails for default NFS packet size
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-net
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat May 05 04:10:11 UTC 2012
>Closed-Date:    
>Last-Modified:  Mon May 07 18:55:42 UTC 2012
>Originator:     Eugene Grosbein
>Release:        FreeBSD 8.3-STABLE i386
>Organization:
RDTC JSC
>Environment:
System: FreeBSD eg.sd.rdtc.ru 8.3-STABLE FreeBSD 8.3-STABLE #44: Fri May 4 14:05:29 NOVT 2012 root@eg.sd.rdtc.ru:/usr/local/obj/usr/local/src/sys/EG i386

>Description:
	I have FreeBSD 8.3-STABLE/i386 as NFS UDP client
	and FreeBSD 8.3-STABLE/amd64 as NFS server.

	In /etc/fstab I have:

syslog:/backup /backup nfs rw,soft,intr,mntudp,noauto 0 0

	With these options, I can get small and medium files from NFS server
	but transfer of large files using rsync always fails:

# rsync -av --delete /backup /data/write
sending incremental file list
backup/system/20120429/
backup/system/20120429/rddtool-20120429.tbz
rsync: read errors mapping "/backup/system/20120429/rddtool-20120429.tbz": Operation timed out (60)

	A workaround is to use '-r=1024,-w=1024' mount options,
	then files transfer just fine.

	Meantime, ping -D -s 1472 runs just fine withous a loss.

	When this error occures, "netstat -ss -p ip" shows that
	'fragments dropped (dup or out of space)' increases with tens
	and hundreds packets.

	Both servers and client were upgraded top 8.3-STABLE
	using RELENG_8 sources of 4 May 2012.

	The same for NFS server based on 7.4-STABLE/i386.

>How-To-Repeat:

	See above.

>Fix:

	Unknown.
>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-net 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Mon May 7 18:55:26 UTC 2012 
Responsible-Changed-Why:  
Over to maintainer(s). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=167603 
>Unformatted:
