Date: Thu, 24 Jun 2010 16:02:32 +0200 (CEST) From: "Walter C. Pelissero" <walter.pelissero@iesy.net> To: FreeBSD-gnats-submit@FreeBSD.org Subject: i386/148204: UDP NFS causes overload Message-ID: <201006241402.o5OE2WSq002710@zaphod.home.lan> Resent-Message-ID: <201006280800.o5S80AVq019144@freefall.freebsd.org>
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>Number: 148204 >Category: i386 >Synopsis: UDP NFS causes overload >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-i386 >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Jun 28 08:00:10 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Walter C. Pelissero >Release: FreeBSD 8.1-PRERELEASE i386 >Organization: >Environment: System: FreeBSD zaphod.home.lan 8.1-PRERELEASE FreeBSD 8.1-PRERELEASE #0: Mon Jun 21 22:28:44 CEST 2010 root@zaphod.home.lan:/usr/home/obj/usr/src/sys/TIGER-MP i386 >Description: Having UDP mounts, like as for this amd.map: * opts:=rw,grpid,resvport,vers=3,proto=udp,nosuid,nodev,intr,rsize=16384,wsize=16384 causes NFS to grind to a halt when doing substantial i/o on the NFS mount. Top shows a number of nfsiod spinning out of control, causing a massive increase of system load (>20). Killing the process responsible for the i/o doesn't help. last pid: 2637; load averages: 20.11, 14.63, 7.53 up 0+00:37:45 16:00:08 197 processes: 23 running, 156 sleeping, 18 waiting CPU: 4.1% user, 0.0% nice, 95.9% system, 0.0% interrupt, 0.0% idle Mem: 613M Active, 53M Inact, 101M Wired, 8228K Cache, 79M Buf, 1227M Free Swap: 2014M Total, 2014M Free PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 2405 root 1 76 - 0K 8K RUN 1 0:34 10.06% nfsiod 10 2403 root 1 76 - 0K 8K RUN 1 0:35 9.96% nfsiod 8 2397 root 1 76 - 0K 8K RUN 1 0:35 9.96% nfsiod 2 2406 root 1 76 - 0K 8K RUN 1 0:35 9.77% nfsiod 11 2412 root 1 76 - 0K 8K RUN 1 0:36 9.57% nfsiod 17 2409 root 1 76 - 0K 8K RUN 1 0:36 9.47% nfsiod 14 2404 root 1 76 - 0K 8K RUN 1 0:35 9.47% nfsiod 9 2396 root 1 76 - 0K 8K RUN 1 0:33 9.47% nfsiod 1 2395 root 1 76 - 0K 8K RUN 1 0:35 9.38% nfsiod 0 2398 root 1 76 - 0K 8K RUN 1 0:37 9.28% nfsiod 3 2399 root 1 76 - 0K 8K RUN 1 0:34 9.28% nfsiod 4 2402 root 1 76 - 0K 8K RUN 1 0:34 9.18% nfsiod 7 2411 root 1 76 - 0K 8K RUN 1 0:35 9.08% nfsiod 16 2410 root 1 76 - 0K 8K RUN 1 0:37 8.98% nfsiod 15 2407 root 1 76 - 0K 8K RUN 1 0:36 8.98% nfsiod 12 2413 root 1 76 - 0K 8K RUN 1 0:37 8.79% nfsiod 18 2408 root 1 76 - 0K 8K RUN 1 0:34 8.79% nfsiod 13 2401 root 1 76 - 0K 8K RUN 1 0:36 8.69% nfsiod 6 2400 root 1 76 - 0K 8K CPU1 0 0:33 8.69% nfsiod 5 2414 root 1 76 - 0K 8K RUN 1 0:34 8.40% nfsiod 19 [...] >How-To-Repeat: cd /to/nfs/mount cp /dev/random . >Fix: I worked around the problem using TCP instead of UDP. >Release-Note: >Audit-Trail: >Unformatted:
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