Why are you using e1000 and not virtio? The virtio drives have
significantly better performance.... Ubuntu should also have native
support for them.
On 8/17/2014 10:34 PM, JHM wrote:
Salutations to all members, first off. This is my first post in the
discussion group.
I searched for this topic, but not much turned up from the archive here.
Searching for "slow"
http://lists.nongnu.org/archive/cgi-bin/namazu.cgi?query=slow&submit=Search!&idxname=qemu-discuss&max=100&result=normal&sort=score
<http://lists.nongnu.org/archive/cgi-bin/namazu.cgi?query=slow&submit=Search%21&idxname=qemu-discuss&max=100&result=normal&sort=score>
I would like to ask if anyone else had troubles with the network
performance in the guest network. I am running qemu using
*ubuntu-14.04 as host*. The *guest is also ubuntu-14.04*. In the guest
OS, I have a LAMP stack properly configured. Users can reach the
apache server inside via a host NATed tap interface. Anything poking
the host at port 80 is passed into the private network between the
guest/host. This all works well, and seems to be OK. Users can view
websites and download files hosted in the guest LAMP.
Except, users are getting very limited download speeds. While the host
sits on a 100Mbps symmetric up/down link, users are only able to
download at 15Kbps or max 30Kbps. I used to have the same setup
running natively without QEMU and user download speeds were great.
Once I moved the LAMP stack into the virtual machine, this issue came
up. The following is the command line used to start up the qemu vm.
qemu-system-x86_64 -hda disk1.qcow -m 1G -smp 4 -enable-kvm -netdev
tap,id=tap0,ifname=tap0,script=tap-config.sh -device e1000,netdev=tap0
Call me naive here, but is this kind of network performance expected?
The guest OS is unusable.
-- Julio H. Morimoto
-- j...@juliohm.com.br <mailto:j...@juliohm.com.br>