Date: Mon, 19 Jul 1999 16:11:16 -0600 From: Wes Peters <wes@softweyr.com> To: Tim Pushor <timp@orion.ab.ca> Cc: questions@freebsd.org, net@freebsd.org Subject: Re: 'Out of buffer space' problem Message-ID: <3793A284.203057B@softweyr.com> References: <000d01bed20d$15024270$9828f99f@shl.com> <379376F4.129C4642@softweyr.com> <004401bed21c$13430870$9828f99f@shl.com>
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Tim Pushor wrote: > Wes Peters ranted: > > Tim Pushor wrote: > > > > > > I work for a rather large organization and have convinced management to > > > replace our aging AIX SMTP relays/DNS servers with Compaq Servers running > > > FreeBSD. Saturday I had officially turned off our old AIX boxes and were > > > running on pure FreeBSD boxes. > > > > > > On the first full day of production, half way through (today) one of the > > > boxes that the companies primary DNS was running on stopped responding. The > > > error I was getting was 'out of buffer space'. > > > > > > I am now in Panic mode, as I am the one responsible for reccomending this > > > solution. > > > > > > Can anyone out there help me track the problem down? I know there can be > > > several factors involved, but I *really* have to get this one licked rather > > > quickly. > > > > Sure, but you'll need to provide some useful information about your systems. > > What version of FreeBSD and BIND are you running? What is the configuration > > of your machine -- CPU(s), memory, and network cards certainly. Have you > > compiled a custom kernel for the machine; if so include the kernel config > > file you're using. If not, the problem is simple to diagnose: you need > > more network buffer space to handle the load. The simplest way to do this > > is to increase the "maxusers" figure in the configuration until the problem > > stops. If you're running the 3.2-RELEASE generic kernel, raise maxusers to > > 64 and try again. > > > > Please, post more information so we can help you. We don't want you to (and > > us by reference) to get embarrased on this. ;^) > > I'm sorry for not providing enough information, I am in panic mode here. > Thanks for listening to me ;-) I *really* hope someone can help.. OK, now we're getting somewhere. A quick point, though: until you've gotten a solution, keep mailing to the lists as well. I'm not necessarily the configuration expert, so we'll want to get lots of eyeballs on this. I've forwarded your reply and my observations to the original lists, which were probably a good starting place. > Hardware: > > Compaq Proliant 1600 PII-450 W/512M RAM, Integrated NCR SCSI, one 4G Wide > SCSI disk, Integrated ThunderLAN 10/100 NIC That should be sufficient for a DNS server. > Software: > > FreeBSD 2.2.8-RELEASE > Stock named (4.9.4?) > Maxusers 256 (so NMBclusters should be 4608) A reasonable starting point. > Config file: > ** BTW this is not really GENERIC So change the comments, like: > # # SHLRELAY, created dd/mm/yyyy from: > # GENERIC -- Generic machine with WD/AHx/NCR/BTx family disks > # > # For more information read the handbook part System Administration -> > # Configuring the FreeBSD Kernel -> The Configuration File. > # The handbook is available in /usr/share/doc/handbook or online as > # latest version from the FreeBSD World Wide Web server > # <URL:http://www.FreeBSD.ORG/>; > # > # An exhaustive list of options and more detailed explanations of the > # device lines is present in the ./LINT configuration file. If you are > # in doubt as to the purpose or necessity of a line, check first in LINT. > # > # $Id: GENERIC,v 1.77.2.28 1998/09/26 17:36:14 wpaul Exp $ > machine "i386" > cpu "I586_CPU" > cpu "I686_CPU" > ident SHLRELAY > maxusers 256 > options INET #InterNETworking > options FFS #Berkeley Fast Filesystem > options MSDOSFS #MSDOS Filesystem > options "CD9660" #ISO 9660 Filesystem > options PROCFS #Process filesystem > options "COMPAT_43" #Compatible with BSD 4.3 [KEEP > THIS!] > options SCSI_DELAY=15 #Be pessimistic about Joe SCSI > device > options FAILSAFE #Be conservative > options IPFIREWALL > options "MAXMEM=(512*1024)" > options INCLUDE_CONFIG_FILE > config kernel root on wd0 > controller isa0 > #controller eisa0 > controller pci0 > controller fdc0 at isa? port "IO_FD1" bio irq 6 drq 2 vector fdintr > disk fd0 at fdc0 drive 0 > disk fd1 at fdc0 drive 1 > options "CMD640" # work around CMD640 chip deficiency > controller wdc0 at isa? port "IO_WD1" bio irq 14 vector wdintr > controller wdc1 at isa? port "IO_WD2" bio irq 15 vector wdintr > options ATAPI #Enable ATAPI support for IDE bus > options ATAPI_STATIC #Don't do it as an LKM > device wcd0 #IDE CD-ROM > # A single entry for any of these controllers (ncr, ahb, ahc, amd) is > # sufficient for any number of installed devices. > controller ncr0 > controller scbus0 > device sd0 > device st0 > device cd0 #Only need one of these, the code dynamically grows > # syscons is the default console driver, resembling an SCO console > device sc0 at isa? port "IO_KBD" tty irq 1 vector scintr > # Mandatory, don't remove > device npx0 at isa? port "IO_NPX" flags 0x1 irq 13 vector > npxintr > device sio0 at isa? port "IO_COM1" tty irq 4 vector siointr > device sio1 at isa? port "IO_COM2" tty irq 3 vector siointr > device lpt0 at isa? port? tty irq 7 vector lptintr > device tl0 > pseudo-device loop > pseudo-device ether > pseudo-device log > pseudo-device vn 4 > pseudo-device tun 4 > pseudo-device pty 32 > pseudo-device gzip # Exec gzipped a.out's > pseudo-device bpfilter 4 > # This provides support for System V shared memory. > # > options SYSVSHM > options SYSVMSG > options SYSVSEM I don't see anything obviously wrong here, either. Send the output of both netstat -m and netstat -s, so we can see what's going on in the network stack. -- "Where am I, and what am I doing in this handbasket?" Wes Peters Softweyr LLC http://softweyr.com/ wes@softweyr.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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