Hi Michal, An update to what I have already said : when I try adding <driver name='qemu' txmode='iothread' ioeventfd='on' event_idx='off' queues='1' rx_queue_size='512' tx_queue_size='512'> although it showed me the error as mentioned, when I checked the xml again I saw that <driver name='qemu' txmode='iothread' ioeventfd='on' event_idx='off' > is added to the interface.
The missing parameters are : queues='1' rx_queue_size='512' tx_queue_size='512' Best Regards, Ashish Kurian On Wed, Oct 25, 2017 at 5:07 PM, Ashish Kurian <[email protected]> wrote: > Hi Michal, > > What I found was that when I restarted the machine and did a virsh edit > command to see the xml config, I see that it is was not actually changed. > This suggests why I saw 256 again after restarting. > > So now I tried again to edit the xml via virsh edit command and used the > following to set the parameters. > > <driver name='qemu' txmode='iothread' ioeventfd='on' event_idx='off' > queues='1' rx_queue_size='512' tx_queue_size='512'> > </driver> > > It was not accepted and I got the error saying : > > > error: XML document failed to validate against schema: Unable to validate > doc against /usr/share/libvirt/schemas/domain.rng > Extra element devices in interleave > Element domain failed to validate content > > What does this imply? I have two more other interfaces and do I have to > the same to them also? > > Btw, there are now logs generated now in the domain log or libvirtd log > > > > > > Best Regards, > Ashish Kurian > > On Wed, Oct 25, 2017 at 2:50 PM, Michal Privoznik <[email protected]> > wrote: > >> On 10/25/2017 01:53 PM, Ashish Kurian wrote: >> > Dear Users/Developers, >> > >> > I am using a KVM Ubuntu VM as a degrader to apply specific delays to >> > incoming packets. As the delay for my packets can be higher than 7.5 >> > seconds, there is not enough buffer on my interface to buffer all the >> > packets. Therefore those overflowing packets are dropped in the machine >> and >> > not forwarded. >> > >> > When I tried to use the command ethtool -G ens8 rx 512 to increase the >> > buffer size, I get the following error. >> > >> > Cannot set device ring parameters: Operation not permitted >> > >> > I have kept the VM xml files as specified in the link : >> > https://libvirt.org/formatdomain.html. The value that I kept in my xml >> file >> > is as follows. >> > >> > <interface type='direct'> >> > <mac address='52:54:00:72:f9:eb'/> >> > <source dev='enp7s0f0' mode='vepa'/> >> > <model type='virtio'/> >> > <driver name='vhost' queues='5' rx_queue_size='512' >> > tx_queue_size='512'> >> > <host csum='off' gso='off' tso4='off' tso6='off' ecn='off' >> ufo='off' >> > mrg_rxbuf='off'/> >> > <guest csum='off' tso4='off' tso6='off' ecn='off' ufo='off'/> >> > </driver> >> > <address type='pci' domain='0x0000' bus='0x00' slot='0x08' >> > function='0x0'/> >> > </interface> >> > <interface type='direct'> >> > <mac address='52:54:00:00:b5:99'/> >> > <source dev='enp7s0f1' mode='vepa'/> >> > <model type='virtio'/> >> > <driver name='vhost' queues='5' rx_queue_size='512' >> > tx_queue_size='512'> >> > <host csum='off' gso='off' tso4='off' tso6='off' ecn='off' >> ufo='off' >> > mrg_rxbuf='off'/> >> > <guest csum='off' tso4='off' tso6='off' ecn='off' ufo='off'/> >> > </driver> >> > <address type='pci' domain='0x0000' bus='0x00' slot='0x09' >> > function='0x0'/> >> >> So what does the qemu command line look like? You can find it in either >> libvirtd log or domain log. >> >> http://wiki.libvirt.org/page/DebugLogs >> >> Michal >> > >
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