>Number: 167603
>Category: kern
>Synopsis: IP fragment reassembly's broken: file transfer over NFSv3/UDP
>fails for default NFS packet size
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>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:
>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 r...@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:
>Unformatted:
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