Re: FAQ on linux-kvm.org has broken link

2013-11-01 Thread Stefan Hajnoczi
On Tue, Oct 29, 2013 at 06:18:05PM +0100, folkert wrote: 2. Get the system into the bad state and then do some deeper. Start with outgoing ping, instrument guest driver and host vhost_net functions to see what the drivers are doing, inspect the transmit vring, etc.

Re: FAQ on linux-kvm.org has broken link

2013-10-29 Thread folkert
2. Get the system into the bad state and then do some deeper. Start with outgoing ping, instrument guest driver and host vhost_net functions to see what the drivers are doing, inspect the transmit vring, etc. Update: have not gotten around to reboot the server for the new

Re: FAQ on linux-kvm.org has broken link

2013-09-03 Thread folkert
Two approaches to get closer to the source of the problem: 1. Try the latest vanilla kernel on the host (Linux 3.10.5). This way you can rule out fixed bugs in vhost_net or tap. 2. Get the system into the bad state and then do some deeper. Start with outgoing ping,

Re: FAQ on linux-kvm.org has broken link

2013-08-27 Thread Stefan Hajnoczi
On Mon, Aug 26, 2013 at 09:50:38PM +0200, folkert wrote: 2. Get the system into the bad state and then do some deeper. Start with outgoing ping, instrument guest driver and host vhost_net functions to see what the drivers are doing, inspect the transmit vring, etc. Okay, it's

Re: FAQ on linux-kvm.org has broken link

2013-08-26 Thread folkert
Hi, 1. Try the latest vanilla kernel on the host (Linux 3.10.5). This way you can rule out fixed bugs in vhost_net or tap. For the last two weeks it went fine for a couple of days each time. This evening was really bad again: uptimes of 5-10 minutes. This is with 3.11-rc4. 2. Get the

Re: FAQ on linux-kvm.org has broken link

2013-08-06 Thread Stefan Hajnoczi
On Mon, Aug 05, 2013 at 10:59:45PM +0200, folkert wrote: Two approaches to get closer to the source of the problem: 1. Try the latest vanilla kernel on the host (Linux 3.10.5). This way you can rule out fixed bugs in vhost_net or tap. 2. Get the system into the bad state and then do

Re: FAQ on linux-kvm.org has broken link

2013-08-05 Thread Stefan Hajnoczi
On Fri, Aug 02, 2013 at 08:06:58PM +0200, folkert wrote: A couple of questions: Please post the QEMU command-line from the host (ps aux | grep qemu). I'll post them all: - UMTS-clone: this one works fine since it was created a weak ago - belle: this one was fine but suddenly also showed

Re: FAQ on linux-kvm.org has broken link

2013-08-05 Thread folkert
If you do find something in dmesg that could be very helpful. Ok it is down again: nothing in dmesg, neither on the guest or in the host. Based on this information it seems like a bug in the virtio_net guest driver or vhost_net on the host. Actually there is one contradictory piece of

Re: FAQ on linux-kvm.org has broken link

2013-08-02 Thread folkert
Hi, If the result is #2, check firewalls on host and guest. Also try the following inside the guest: disable the network interface, rmmod virtio_net, modprobe virtio_net again, and bring the network up. I pinged, I sniffed, I updated the bug report (it also happens with other guests now!).

Re: FAQ on linux-kvm.org has broken link

2013-08-02 Thread Stefan Hajnoczi
On Fri, Aug 2, 2013 at 1:37 PM, folkert folk...@vanheusden.com wrote: If the result is #2, check firewalls on host and guest. Also try the following inside the guest: disable the network interface, rmmod virtio_net, modprobe virtio_net again, and bring the network up. I pinged, I sniffed, I

Re: FAQ on linux-kvm.org has broken link

2013-08-02 Thread folkert
Hi Stefan, I pinged, I sniffed, I updated the bug report (it also happens with other guests now!). And the bring down interfaces / rmmod / modprobe / ifup works! So I think something is wrong with virtio_net! What shall I do now? I wrote a reply earlier today but it was

Re: FAQ on linux-kvm.org has broken link

2013-07-31 Thread Stefan Hajnoczi
On Tue, Jul 30, 2013 at 10:45:20PM +0200, folkert wrote: If you keep losing network connectivity you may have a MAC or IP address conflict. The symptom is that network traffic is intermittent - for example, ping might work but a full TCP connection does not. I submitted a bug at bugzilla

Re: FAQ on linux-kvm.org has broken link

2013-07-30 Thread Stefan Hajnoczi
On Tue, Jul 30, 2013 at 03:18:53AM +0200, folkert wrote: The link at: http://www.linux-kvm.org/page/FAQ#My_guest_network_is_stuck_what_should_I_do.3F pointing to: http://qemu-buch.de/cgi-bin/moin.cgi/QemuNetwork is broken: it gives a Internal server error message. Please someone point me

Re: FAQ on linux-kvm.org has broken link

2013-07-30 Thread folkert
The link at: http://www.linux-kvm.org/page/FAQ#My_guest_network_is_stuck_what_should_I_do.3F pointing to: http://qemu-buch.de/cgi-bin/moin.cgi/QemuNetwork is broken: it gives a Internal server error message. Please someone point me to the correct location as I'm struggeling with a

Re: FAQ on linux-kvm.org has broken link

2013-07-30 Thread folkert
If you keep losing network connectivity you may have a MAC or IP address conflict. The symptom is that network traffic is intermittent - for example, ping might work but a full TCP connection does not. I submitted a bug at bugzilla a while ago which I updated today with new findings:

FAQ on linux-kvm.org has broken link

2013-07-29 Thread folkert
Hi, The link at: http://www.linux-kvm.org/page/FAQ#My_guest_network_is_stuck_what_should_I_do.3F pointing to: http://qemu-buch.de/cgi-bin/moin.cgi/QemuNetwork is broken: it gives a Internal server error message. Please someone point me to the correct location as I'm struggeling with a VM losing