Re: still seeing network freezes with rtl8139 nic

[david ahern <daahern@cisco.com>]

Try adding the noapic option to your guest kernel. I re-ran that test on kvm-62
and my VM was able to run under load for more than 3-1/2 days (the network never
locked up; I stopped the test to try other variations).

One side effect of the noapic option is that irq balancing is disabled -- all
interrupts are delivered via CPU 0. I ran a few tests earlier this week without
the noapic option (hence with the apic) but with irq balancing disabled and
still had the lockups. It seems to be something specific to the apic.

david


Eckersid SIlapaswang wrote:
> david ahern <daahern <at> cisco.com> writes:
> 
>> I know this issue has been discussed on this list before, but I am still
>> experiencing network freezes in a guest that requires a restart to clear. When
>> the network freezes in the guest I no longer see the network interrupts counter
>> incrementing (i.e., the eth0 counter in /proc/interrupts in the guest). Using
>> the crash utility, I verified that the interrupt is still enabled on the guest
>> side and that no interrupts are pending. This suggests that the interrupts are
>> not getting delivered to the VM.
> 
> I just wanted to let the developers know that I'm having similar problems
> concerning interrupts with networking dying as well.
> 
> Running a stress test of kvm using an EnGarde Secure Linux 1.5 guest OS.
> Under a heavy network email load, the guest OS networking gets knocked out
> - unable to ping, ssh, etc. Can only get things started again by going
> into vncviewer and restarting the networking services from there.
> 
> CPUs: 8 x Intel(R) Xeon(R) CPU E5335 @ 2.00GHz
> KVM 52-1
> Host Kernel: 2.6.25-rc2
> Kernel Arch: x86_64
> Guest OS: EnGarde Secure Linux 32bit i686, 2.4.31-1.5.60
> 
> Command Line:
> /usr/bin/qemu-system -hda /root/images/bwimail01.img -boot c -m 384 -smp 4
> -std-vga -net nic,vlan=0,macaddr=52:54:00:12:34:6F -net
> tap,ifname=tap1,script=/etc/qemu-ifup -vnc 192.168.1.57:1 &
> 
> Please let me know if you need anymore information and if I could be of any
> assistance in providing information to have this issue resolved.
> 
> 
> 
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