On Mon, Feb 28, 2011 at 7:06 PM, geppz <no_carr...@plasmacore.com> wrote: > Going with tcpdump -e from within the guest, I have identified that the > problem is when a big enough packet is outputed. > I tried a few times with dmesg, and as soon as the tcp packet reaches the > following length: > > 18:38:28.340097 52:54:69:b5:89:11 (oui Unknown) > 00:19:b9:81:2c:52 (oui > Unknown), ethertype IPv4 (0x0800), length 1514: 192.168.7.38.ssh > > 192.168.7.52.59008: Flags [.], ack 2824, win 64436, options [nop,nop,TS > val 27488132 ecr 6063255], length 1448 > > it cannot get through. Then the IP stack tries and retries to send the > same identical packet, but there will never be any reply from the other > side. Finally the socket is torn down. > > I have bridged networking for the VM. My bridge is a normal linux bridge br0 > with MTU 1500. > Has MTU anything to do with all this? > Is it a linux-bridge bug or a qemu-kvm bug?
Excellent, thanks for posting these details. The bug is probably in the NIC hardware emulation and I think we can track this one down fairly easily. Can you please post your qemu-kvm command-line including the NIC model that you are using? Stefan -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/638955 Title: emulated netcards don't work with recent sunos kernel Status in QEMU: New Bug description: hi there, i'm using qemu-kvm backend in version: # qemu-kvm -version QEMU PC emulator version 0.12.5 (qemu-kvm-0.12.5), Copyright (c) 2003-2008 Fabrice Bellard and there are just *not working any of model=$type with combinations of recent sunos (solaris, openindiana, opensolaris, ..) .. you can download for testing purposes iso from here: http://dlc- origin.openindiana.org/isos/147/ or from here: http://genunix.org/distributions/indiana/ << osol and oi are also bubuntu-like *live cds, so no need to bother with installing behaviour is as follows: e1000 - receiving doesn't work, transmitting works .. dladm (tool for handle ethers) shows that is all ok, correct mode is loaded up, it just seems like this driver works at 100% but .. rtl8169|pcnet - works in 10Mbit mode with several other issues like high cpu utilization and so .. dladm is unable to recognize options for this kind of -nic others - just don't work .. i experienced this issue several times in past .. woraround was, that rtl8169 worked so-so .. with recent sunos kernel it doesn't. it's easy to reproduce, this is why i'm not putting here more then launching script for my virtual machine: # cat openindiana.sh qemu-kvm -hda /home/kvm/openindiana/openindiana.img -m 2048 -localtime -cdrom /home/kvm/+images/oi-dev-147-x86.iso -boot d \ -vga std -vnc :9 -k en-us -monitor unix:/home/kvm/openindiana/instance,server,nowait \ -net nic,model=e1000,vlan=1 -net tap,ifname=oi0,script=no,vlan=1 & sleep 2; ip l set oi0 up; ip a a 192.168.99.9/24 dev oi0; regards by daniel