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Date: Thu, 31 Jan 2008 16:09:31 +0100 From: Claude Frantz <r31dmaeu@...312a.rz.unibw-muenchen.de> To: linux-kernel@...r.kernel.org Subject: degrading performance (NFS v.3 client) Hello ! Please allow me to submit to you a question related to a system which is a NFS v3 client for a Netapp server. The home directories are NFS attached. The following behaviour occurs sometimes. The system becomes very slow. The load average is increasing but the most interesting observation is the increase of the %iowait. After reboot the system is running well for many days, then the problem occurs again. Any idea ? Thanks a lot ! Claude kernel: 2.6.23.12-52.fc7 (Fedora 7) "sar -q" output 07:00:01 AM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 07:10:02 AM 0 443 0.86 0.56 0.36 07:20:01 AM 0 481 0.40 0.47 0.40 07:30:01 AM 0 514 0.77 0.62 0.48 07:40:01 AM 0 558 0.70 0.55 0.47 07:50:01 AM 0 556 0.48 0.56 0.52 08:00:01 AM 1 575 0.60 0.56 0.53 08:10:01 AM 1 585 0.60 0.58 0.54 08:20:01 AM 0 625 0.40 0.75 0.68 08:30:01 AM 1 636 1.15 1.10 0.88 08:40:01 AM 1 774 23.99 9.99 4.21 08:50:01 AM 3 718 7.47 11.15 7.75 09:00:01 AM 6 770 8.85 6.34 6.38 09:10:01 AM 6 824 19.37 15.57 10.67 09:20:01 AM 1 864 16.30 15.40 12.98 09:30:01 AM 4 917 14.73 16.66 15.00 09:40:01 AM 4 1003 34.09 24.82 19.48 09:50:01 AM 3 1050 26.25 26.58 23.02 10:00:02 AM 2 1109 27.68 29.40 26.46 10:10:01 AM 1 1086 22.35 25.97 26.53 Average: 1 489 3.52 3.19 2.68 10:15:58 AM LINUX RESTART 10:20:01 AM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 10:30:01 AM 2 817 1.77 1.74 1.17 10:40:01 AM 0 902 1.35 1.65 1.39 10:50:01 AM 2 937 1.52 2.07 1.74 11:00:01 AM 1 932 1.74 1.56 1.58 11:10:01 AM 2 972 2.17 1.74 1.62 11:20:01 AM 1 1008 1.48 1.63 1.64 11:30:02 AM 1 1018 1.85 2.09 1.90 11:40:01 AM 7 1060 5.00 8.76 6.10 11:50:01 AM 1 1087 6.17 7.47 6.76 12:00:01 PM 2 1095 3.61 4.72 5.60 12:10:01 PM 9 1107 4.66 4.66 5.19 12:20:01 PM 4 1135 3.30 3.79 4.52 12:30:01 PM 5 1215 32.66 16.54 8.98 12:40:01 PM 5 1157 3.99 7.20 8.14 12:50:01 PM 2 1155 8.45 9.40 8.76 "sar -u" output 07:00:01 AM CPU %user %nice %system %iowait %steal %idle 07:10:02 AM all 3.01 0.01 5.68 1.57 0.00 89.73 07:20:01 AM all 3.55 0.01 6.26 1.72 0.00 88.46 07:30:01 AM all 5.09 0.06 8.11 1.87 0.00 84.87 07:40:01 AM all 5.00 0.00 7.83 1.52 0.00 85.65 07:50:01 AM all 5.67 0.00 8.31 1.70 0.00 84.31 08:00:01 AM all 3.99 0.01 7.76 1.32 0.00 86.92 08:10:01 AM all 4.80 0.01 8.43 2.09 0.00 84.67 08:20:01 AM all 5.19 0.00 10.86 2.13 0.00 81.82 08:30:01 AM all 7.11 0.06 12.08 2.60 0.00 78.14 08:40:01 AM all 9.34 0.00 17.74 5.48 0.00 67.43 08:50:01 AM all 12.71 0.00 31.01 11.59 0.00 44.68 09:00:01 AM all 10.32 0.00 24.47 4.45 0.00 60.76 09:10:01 AM all 11.62 0.00 31.83 15.74 0.00 40.81 09:20:01 AM all 13.45 0.00 32.63 15.31 0.00 38.60 09:30:01 AM all 12.23 0.07 32.96 18.86 0.00 35.88 09:40:01 AM all 11.45 0.00 32.75 25.88 0.00 29.93 09:50:01 AM all 13.34 0.00 33.04 34.10 0.00 19.52 10:00:02 AM all 13.23 0.00 33.28 34.18 0.00 19.30 10:10:01 AM all 13.68 0.00 33.43 28.89 0.00 24.00 Average: all 4.00 0.02 8.18 3.70 0.00 84.09 10:15:58 AM LINUX RESTART 10:20:01 AM CPU %user %nice %system %iowait %steal %idle 10:30:01 AM all 12.93 0.00 15.33 6.77 0.00 64.98 10:40:01 AM all 13.73 0.00 13.51 5.83 0.00 66.92 10:50:01 AM all 12.13 0.00 17.42 5.04 0.00 65.41 11:00:01 AM all 10.68 0.00 14.59 3.72 0.00 71.01 11:10:01 AM all 11.27 0.00 14.40 4.71 0.00 69.62 11:20:01 AM all 10.97 0.13 14.97 3.76 0.00 70.17 11:30:02 AM all 13.10 0.00 18.71 3.72 0.00 64.47 11:40:01 AM all 15.59 0.00 28.22 12.29 0.00 43.90 11:50:01 AM all 15.07 0.00 31.73 7.00 0.00 46.20 12:00:01 PM all 13.13 0.00 26.36 4.39 0.00 56.12 12:10:01 PM all 14.95 0.00 27.19 6.65 0.00 51.21 12:20:01 PM all 13.02 0.06 25.71 4.03 0.00 57.18 12:30:01 PM all 15.18 0.00 29.02 10.21 0.00 45.58 12:40:01 PM all 14.28 0.00 28.58 9.56 0.00 47.58 12:50:01 PM all 15.22 0.00 34.07 7.90 0.00 42.80 "mount" options: (rw,rsize=32768,wsize=32768,nfsvers=3,tcp,hard,nointr,timeo=600,addr=102.103.104.105) from "sysctl -a" sunrpc.rpc_debug = 0 sunrpc.nfs_debug = 0 sunrpc.nfsd_debug = 0 sunrpc.nlm_debug = 0 sunrpc.udp_slot_table_entries = 16 sunrpc.tcp_slot_table_entries = 16 sunrpc.min_resvport = 665 sunrpc.max_resvport = 1023 fs.nfs.nlm_grace_period = 0 fs.nfs.nlm_timeout = 10 fs.nfs.nlm_udpport = 32769 fs.nfs.nlm_tcpport = 32803 fs.nfs.nsm_use_hostnames = 0 fs.nfs.nsm_local_state = 51 fs.nfs.nfs_callback_tcpport = 0 fs.nfs.idmap_cache_timeout = 600 fs.nfs.nfs_mountpoint_timeout = 500 fs.nfs.nfs_congestion_kb = 91328 net.ipv4.tcp_timestamps = 1 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_sack = 1 net.ipv4.tcp_retrans_collapse = 1 net.ipv4.ip_forward = 0 net.ipv4.ip_default_ttl = 64 net.ipv4.ip_no_pmtu_disc = 0 net.ipv4.ip_nonlocal_bind = 0 net.ipv4.tcp_syn_retries = 5 net.ipv4.tcp_synack_retries = 5 net.ipv4.tcp_max_orphans = 32768 net.ipv4.tcp_max_tw_buckets = 180000 net.ipv4.ipfrag_high_thresh = 262144 net.ipv4.ipfrag_low_thresh = 196608 net.ipv4.ip_dynaddr = 0 net.ipv4.ipfrag_time = 30 net.ipv4.tcp_keepalive_time = 7200 net.ipv4.tcp_keepalive_probes = 9 net.ipv4.tcp_keepalive_intvl = 75 net.ipv4.tcp_retries1 = 3 net.ipv4.tcp_retries2 = 15 net.ipv4.tcp_fin_timeout = 60 net.ipv4.tcp_syncookies = 0 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_abort_on_overflow = 0 net.ipv4.tcp_stdurg = 0 net.ipv4.tcp_rfc1337 = 0 net.ipv4.tcp_max_syn_backlog = 1024 net.ipv4.ip_local_port_range = 32768 61000 net.ipv4.icmp_echo_ignore_all = 0 net.ipv4.icmp_echo_ignore_broadcasts = 1 net.ipv4.icmp_ignore_bogus_error_responses = 1 net.ipv4.icmp_errors_use_inbound_ifaddr = 0 net.ipv4.route.min_delay = 2 net.ipv4.route.max_delay = 10 net.ipv4.route.gc_thresh = 32768 net.ipv4.route.max_size = 524288 net.ipv4.route.gc_min_interval = 0 net.ipv4.route.gc_min_interval_ms = 500 net.ipv4.route.gc_timeout = 300 net.ipv4.route.gc_interval = 60 net.ipv4.route.redirect_load = 20 net.ipv4.route.redirect_number = 9 net.ipv4.route.redirect_silence = 20480 net.ipv4.route.error_cost = 1000 net.ipv4.route.error_burst = 5000 net.ipv4.route.gc_elasticity = 8 net.ipv4.route.mtu_expires = 600 net.ipv4.route.min_pmtu = 552 net.ipv4.route.min_adv_mss = 256 net.ipv4.route.secret_interval = 600 net.ipv4.igmp_max_memberships = 20 net.ipv4.igmp_max_msf = 10 net.ipv4.inet_peer_threshold = 65664 net.ipv4.inet_peer_minttl = 120 net.ipv4.inet_peer_maxttl = 600 net.ipv4.inet_peer_gc_mintime = 10 net.ipv4.inet_peer_gc_maxtime = 120 net.ipv4.tcp_orphan_retries = 0 net.ipv4.tcp_fack = 1 net.ipv4.tcp_reordering = 3 net.ipv4.tcp_ecn = 0 net.ipv4.tcp_dsack = 1 net.ipv4.tcp_mem = 780288 1040384 1560576 net.ipv4.tcp_wmem = 4096 16384 4194304 net.ipv4.tcp_rmem = 4096 87380 4194304 net.ipv4.tcp_app_win = 31 net.ipv4.tcp_adv_win_scale = 2 net.ipv4.icmp_ratelimit = 1000 net.ipv4.icmp_ratemask = 6168 net.ipv4.tcp_tw_reuse = 0 net.ipv4.tcp_frto = 0 net.ipv4.tcp_frto_response = 0 net.ipv4.tcp_low_latency = 0 net.ipv4.ipfrag_secret_interval = 600 net.ipv4.ipfrag_max_dist = 64 net.ipv4.tcp_no_metrics_save = 0 net.ipv4.tcp_moderate_rcvbuf = 1 net.ipv4.tcp_tso_win_divisor = 3 net.ipv4.tcp_congestion_control = cubic net.ipv4.tcp_abc = 0 net.ipv4.tcp_mtu_probing = 0 net.ipv4.tcp_base_mss = 512 net.ipv4.tcp_workaround_signed_windows = 0 net.ipv4.tcp_dma_copybreak = 4096 net.ipv4.tcp_slow_start_after_idle = 1 net.ipv4.cipso_cache_enable = 1 net.ipv4.cipso_cache_bucket_size = 10 net.ipv4.cipso_rbm_optfmt = 0 net.ipv4.cipso_rbm_strictvalid = 1 net.ipv4.tcp_available_congestion_control = cubic reno net.ipv4.tcp_allowed_congestion_control = cubic reno net.ipv4.tcp_max_ssthresh = 0 net.ipv4.neigh.default.mcast_solicit = 3 net.ipv4.neigh.default.ucast_solicit = 3 net.ipv4.neigh.default.app_solicit = 0 net.ipv4.neigh.default.retrans_time = 99 net.ipv4.neigh.default.base_reachable_time = 30 net.ipv4.neigh.default.delay_first_probe_time = 5 net.ipv4.neigh.default.gc_stale_time = 60 net.ipv4.neigh.default.unres_qlen = 3 net.ipv4.neigh.default.proxy_qlen = 64 net.ipv4.neigh.default.anycast_delay = 99 net.ipv4.neigh.default.proxy_delay = 79 net.ipv4.neigh.default.locktime = 99 net.ipv4.neigh.default.gc_interval = 30 net.ipv4.neigh.default.gc_thresh1 = 128 net.ipv4.neigh.default.gc_thresh2 = 512 net.ipv4.neigh.default.gc_thresh3 = 1024 net.ipv4.neigh.default.retrans_time_ms = 1000 net.ipv4.neigh.default.base_reachable_time_ms = 30000 net.ipv4.neigh.eth0.mcast_solicit = 3 net.ipv4.neigh.eth0.ucast_solicit = 3 net.ipv4.neigh.eth0.app_solicit = 0 net.ipv4.neigh.eth0.retrans_time = 99 net.ipv4.neigh.eth0.base_reachable_time = 30 net.ipv4.neigh.eth0.delay_first_probe_time = 5 net.ipv4.neigh.eth0.gc_stale_time = 60 net.ipv4.neigh.eth0.unres_qlen = 3 net.ipv4.neigh.eth0.proxy_qlen = 64 net.ipv4.neigh.eth0.anycast_delay = 99 net.ipv4.neigh.eth0.proxy_delay = 79 net.ipv4.neigh.eth0.locktime = 99 net.ipv4.neigh.eth0.retrans_time_ms = 1000 net.ipv4.neigh.eth0.base_reachable_time_ms = 30000 net.ipv4.conf.all.forwarding = 0 net.ipv4.conf.all.mc_forwarding = 0 net.ipv4.conf.all.accept_redirects = 1 net.ipv4.conf.all.secure_redirects = 1 net.ipv4.conf.all.shared_media = 1 net.ipv4.conf.all.rp_filter = 0 net.ipv4.conf.all.send_redirects = 1 net.ipv4.conf.all.accept_source_route = 0 net.ipv4.conf.all.proxy_arp = 0 net.ipv4.conf.all.medium_id = 0 net.ipv4.conf.all.bootp_relay = 0 net.ipv4.conf.all.log_martians = 0 net.ipv4.conf.all.tag = 0 net.ipv4.conf.all.arp_filter = 0 net.ipv4.conf.all.arp_announce = 0 net.ipv4.conf.all.arp_ignore = 0 net.ipv4.conf.all.arp_accept = 0 net.ipv4.conf.all.disable_xfrm = 0 net.ipv4.conf.all.disable_policy = 0 net.ipv4.conf.all.force_igmp_version = 0 net.ipv4.conf.all.promote_secondaries = 0 net.ipv4.conf.default.forwarding = 0 net.ipv4.conf.default.mc_forwarding = 0 net.ipv4.conf.default.accept_redirects = 1 net.ipv4.conf.default.secure_redirects = 1 net.ipv4.conf.default.shared_media = 1 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.default.send_redirects = 1 net.ipv4.conf.default.accept_source_route = 0 net.ipv4.conf.default.proxy_arp = 0 net.ipv4.conf.default.medium_id = 0 net.ipv4.conf.default.bootp_relay = 0 net.ipv4.conf.default.log_martians = 0 net.ipv4.conf.default.tag = 0 net.ipv4.conf.default.arp_filter = 0 net.ipv4.conf.default.arp_announce = 0 net.ipv4.conf.default.arp_ignore = 0 net.ipv4.conf.default.arp_accept = 0 net.ipv4.conf.default.disable_xfrm = 0 net.ipv4.conf.default.disable_policy = 0 net.ipv4.conf.default.force_igmp_version = 0 net.ipv4.conf.default.promote_secondaries = 0 net.ipv4.conf.eth0.forwarding = 0 net.ipv4.conf.eth0.mc_forwarding = 0 net.ipv4.conf.eth0.accept_redirects = 1 net.ipv4.conf.eth0.secure_redirects = 1 net.ipv4.conf.eth0.shared_media = 1 net.ipv4.conf.eth0.rp_filter = 1 net.ipv4.conf.eth0.send_redirects = 1 net.ipv4.conf.eth0.accept_source_route = 0 net.ipv4.conf.eth0.proxy_arp = 0 net.ipv4.conf.eth0.medium_id = 0 net.ipv4.conf.eth0.bootp_relay = 0 net.ipv4.conf.eth0.log_martians = 0 net.ipv4.conf.eth0.tag = 0 net.ipv4.conf.eth0.arp_filter = 0 net.ipv4.conf.eth0.arp_announce = 0 net.ipv4.conf.eth0.arp_ignore = 0 net.ipv4.conf.eth0.arp_accept = 0 net.ipv4.conf.eth0.disable_xfrm = 0 net.ipv4.conf.eth0.disable_policy = 0 net.ipv4.conf.eth0.force_igmp_version = 0 net.ipv4.conf.eth0.promote_secondaries = 0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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