Date: Tue, 17 Aug 2010 10:54:04 -0700 From: Mark Morley <mark@islandnet.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: FreeBSD Stable <freebsd-stable@freebsd.org>, Mark Morley <mark@islandnet.com> Subject: Re: NFS stalling on 8.1-STABLE Message-ID: <9c4ecm1t.1282067644@helpdesk.islandnet.com>
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On Sun, 15 Aug 2010 23:35:50 -0700 Jeremy Chadwick <freebsd@jdc.parodius.com> wrote: >On Thu, Aug 12, 2010 at 10:35:49AM -0700, Mark Morley wrote: >> I have five front end web servers that all mount their content from >> the same server via NFS. If I stress the link on any one of the >> machines (eg: copy a large directory with a lot of files to/from the >> mounted file system) the client will pause. That is, all processes >> trying to access that mount will freeze. The log files with hundreds >> or thousands of nfs server not responding / is alive again messages. >> After 60 seconds it returns to normal, unless the load is still there >> in which case it continues to pause. >> >> This has only started happening since I upgraded the client machines >> to 8.1-STABLE (previously four of them were 8.0 and one was 7.3). The >> server is 7.1-RELEASE-p11. No other changes have taken place in terms >> of hardware or software or mount options, etc. >> >> All nics involved are gigabit em cards, and they are on a private >> network (web access to the boxes is via an external interface). > >Are there any indications in dmesg that the NIC is responsible, e.g. >interface down/up, etc.? No, nothing like that. >Does switching to UDP-based NFS solve the problem for you? Trying that now for the past 24 hours or so. Four of the machine seem ok so far, but the fifth one has started dropping the mount entirely. Access to it gives an "Input / output error" message. Forcing a dismount and remounting brings it back. >What OS version (uname -a) and NIC are used on the NFS server? FreeBSD xxx 7.1-RELEASE-p11 FreeBSD 7.1-RELEASE-p11 #0: Wed May 26 03:20:59 PDT 2010 root@xxx:/usr/obj/usr/src/sys/CUSTOM i386 NICs are em >Can you please provide the following output from one of the client >machines running 8.1-STABLE with gigE em(4)? You can X-out machine >names, MAC addresses, and IP addresses/netblocks if need be. > >* uname -a FreeBSD xxx 8.1-STABLE FreeBSD 8.1-STABLE #0: Tue Jul 27 16:27:44 PDT 2010 root@xxx:/usr/obj/usr/src/sys/CUSTOM amd64 >* ifconfig emX (where X is the interface number which would be > used for NFS) em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC> ether 00:0e:0c:85:d5:0d inet 192.168.1.30 netmask 0xffffff00 broadcast 192.168.1.255 media: Ethernet 1000baseT <full-duplex> status: active >* netstat -idn -I emX Name Mtu Network Address Ipkts Ierrs Idrop Opkts Oerrs Coll Drop em0 1500 <Link#1> 00:0e:0c:85:d5:0d 39913814 2 0 39949943 0 0 0 em0 1500 192.168.1.0/2 192.168.1.30 39944016 - - 39949664 - - - >* pciconf -lvc (provide only the data for emX please) em0@pci0:1:6:0: class=0x020000 card=0x13768086 chip=0x107c8086 rev=0x05 hdr=0x00 vendor = 'Intel Corporation' device = 'Gigabit Ethernet Controller (Copper) rev 5 (82541PI)' class = network subclass = ethernet cap 01[dc] = powerspec 2 supports D0 D3 current D0 cap 07[e4] = PCI-X supports 2048 burst read, 1 split transaction >* vmstat -i interrupt total rate irq1: atkbd0 239 0 irq16: em0 36746591 883 irq18: em1 12658607 304 irq21: ohci0 2 0 irq22: ehci0 528002 12 irq23: atapci1 2334936 56 cpu0: timer 83207296 2000 cpu1: timer 83207289 2000 Total 218682962 5256 >* sysctl hw.pci hw.pci.usb_early_takeover: 1 hw.pci.honor_msi_blacklist: 1 hw.pci.enable_msix: 1 hw.pci.enable_msi: 1 hw.pci.do_power_resume: 1 hw.pci.do_power_nodriver: 0 hw.pci.enable_io_modes: 1 hw.pci.default_vgapci_unit: -1 hw.pci.host_mem_start: 2147483648 hw.pci.mcfg: 1 >* As root, run "sysctl dev.em.X.stats=1" then do "dmesg" and > provide the output for NIC statistics (will start with "emX:") em0: Excessive collisions = 0 em0: Sequence errors = 0 em0: Defer count = 52 em0: Missed Packets = 0 em0: Receive No Buffers = 0 em0: Receive Length Errors = 0 em0: Receive errors = 1 em0: Crc errors = 1 em0: Alignment errors = 0 em0: Collision/Carrier extension errors = 0 em0: RX overruns = 0 em0: watchdog timeouts = 0 em0: RX MSIX IRQ = 0 TX MSIX IRQ = 0 LINK MSIX IRQ = 0 em0: XON Rcvd = 54 em0: XON Xmtd = 0 em0: XOFF Rcvd = 54 em0: XOFF Xmtd = 0 em0: Good Packets Rcvd = 39915088 em0: Good Packets Xmtd = 39951839 Mark
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