Re: Performance/lockup issues with FreeBSD as a router

From: Peter Kieser (pfak_at_telus.net)
Date: 05/26/05

  • Next message: Mike Jakubik: "Re: Performance/lockup issues with FreeBSD as a router" 
    Date: Thu, 26 May 2005 11:52:51 -0700
To: Charles Swiger <cswiger@mac.com>

    Quoting Charles Swiger <cswiger@mac.com>:

    > On May 26, 2005, at 1:47 PM, Peter Kieser wrote:
    > > The nics are if_dc, this is a stock FreeBSD 5.4-RELEASE
    > > installation (no
    > > firewall or anything):
    > >
    > > Here's my /etc/sysctl.conf:
    > >
    > > net.inet.ip.rtexpire=1800
    > > net.inet.ip.rtminexpire=1800
    > > kern.maxfiles=32768
    > > kern.maxfilesperproc=32768
    > > kern.ipc.somaxconn=32767
    > > net.inet.tcp.sendspace=256000
    > > net.inet.tcp.recvspace=256000
    > > kern.ipc.maxsockbuf=2097152
    > > net.inet.ip.fastforwarding=1
    > > net.inet.tcp.rfc1323=1
    > > net.link.ether.inet.max_age=600
    > > net.inet.tcp.msl=7500
    > > net.inet.ip.fw.dyn_udp_lifetime=10
    > > net.inet.ip.fw.dyn_buckets=1024
    > >
    > > And here's my /boot/loader.conf:
    > >
    > > kern.ipc.maxsockets="163840"
    > > kern.maxusers="2048"
    > >
    > > Is there anythign I'm overlooking that would be causing the machine
    > > to lockup
    > > like this?
    >
    > Your settings are tuned so high that you may be running out of KVA
    > memory. I bet the system would be happier if you let maxusers
    > autotune itself (and then maybe adjust it by a factor of 2 from
    > there), and if you reduced kern.maxfilesperproc to 2048 or less, and
    > reduced the TCP sendspace to 65K.
    >
    > [ As a last resort, you might even try nixing the fastforwarding
    > option. It's well-suited for your task, and you do want it on if it
    > is working right, but maybe try running without it for a test. ]
    >
    > --
    > -Chuck
    >
    >

    I've tried without fast forwarding, I've tried without the TCP sendspace as well
    as reducing it to 65K, I let maxusers auto tune itself and I've even tried uping
    the KVA space.

    I'm at a loss, what would be the ideal sysctl's/loader.conf for a router thats
    doing a fair amount of traffic?

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