At 04:28 AM 12/3/2009, Igor V. Ruzanov wrote:
Hello!
I have updated FreeBSD 8.0 sources via cvsup and compiled system. uname -a
shows:
FreeBSD localhost 8.0-RELEASE FreeBSD 8.0-RELEASE #2: Mon Nov 30 20:15:12
MSD 2009 r...@localhost:/usr/src/sys/i386/compile/HOME-PAE i386
Machine has 3 physical interfaces:
- em0 (PCI/Intel PWLA 8390 MT)
- em1 (PCI/Intel PWLA 8390 MT)
- fxp0 (PCI/Intel EtherExpress PRO/100)
and 2 VLANs: vlan317 and vlan320.
Also there is one interface built in motherboard:
- ale0 (PCI-E/Atheros AR8121)
One physical interface (em0) is in trunk mode (802.1Q) to configure these
two VLANs (vlan317 and vlan320) interfaces. Machine acts as BGP router. It
has 3 uplinks:
- vlan317
- vlan320
- fxp0
and one backbone interface:
- em1.
Next, i recompiled all userland and made all necessary configurations
after which the machine became as production BGP router installed in
server room. So issue looks like the following:
After 20-30 minutes of stable work, the system starts to "retire into
itself": any user processes (bgpd, zebra, named) don't respond, For
example a can't telnet to bgpd control terminal, telnet just dies showing:
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'
I even tried to login into system from local console. But when i pressed
Enter after username was typed, the console just hang. Power button also
doesn't respond (in usual case pressing on Power button gives the machine
is going to power off). One interesting thing: after system was booted,
top command shows:
system eats about 28-30% of CPU time
interrupts eat about only 6-7% of CPU time
all user processes eat less than 0-1% of CPU time
On another working machine (same BGP router, but system is FreeBSD
7.0-STABLE p4) the picture seems to be different:
system etas 9-10% of CPU time
interrupts eat 15-16% of CPU time
So my question is the REASONS that cause such system behavior. I read
UPDATING, so kernel in FreeBSD 8.0 RELEASE was largely reworked, in
particular - SMPng in order to remove all non-MPSAFE driver's locks
(netperf project). Are there new specific kernel config options to get
better perfomance of network subsystem? Or should i set some sysctl variables?
My hardware:
- Motherboard: ASUS P5P43TD (with built in Gigabit LAN Atheros AR8121)
- Core 2 Quad CPU
- 4G RAM (2x2048)
kernel compiled with PAE support, ULE-scheduler, with PREEMPTION option.
If you need whole kernel config, please let me know, i will post it ASAP.
Thanks in advance!
+-------------------------------------------+
! CANMOS ISP Network !
+-------------------------------------------+
! Best regards !
! Igor V. Ruzanov, network operational staff!
! e-Mail: ig...@canmos.ru !
+-------------------------------------------+
You need to check your network setups:
ifconfig -a
You can really only have one NIC on a single network. With multiple NICs
if they are on the same network, you will have arp issues causing routing
issues. You can easily check the arp table before and after you see this
behavior doing:
arp -a
after a reboot, then after the system becomes unresponsive after 30-40 minutes.
Multiple NICs are necessary if you are using this system as a firewall or
packet filter.
To narrow down your problem you may want to disable any NICs that are not
necessary and see if the problem persists.
Hope this helps.
-Derek
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