Date: Sat, 5 May 2012 11:09:51 +0700 (NOVT) From: Eugene Grosbein <egrosbein@rdtc.ru> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/167603: IP fragment reassembly's broken: file transfer over NFSv3/UDP fails for default NFS packet size Message-ID: <201205050409.q4549pkM003492@eg.sd.rdtc.ru> Resent-Message-ID: <201205050410.q454ACjP022600@freefall.freebsd.org>
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>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 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: >Unformatted:
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