On 20/01/2016 21:12, Roy Shterman wrote: > Hi, > > I have two questions, > > First, I'm developing for Libiscsi and trying to work with virtio-scsi > dataplane or even virtio-blk dataplane and it doesn't works well. > > I'm working with latest qemu and latest Libiscsi in RedHat 7 libvirt > package. > > my iscsi xml part is : > > virtio-blk - > > <disk type='network' device='lun'> > <driver name='qemu' type='raw'/> > <source protocol='iscsi' name='iqn.2001-04.com.r-dcs03-tgt-3/1'> > <host name='11.212.32.52' port='3260'/> > </source> > <target dev='vdb' bus='virtio'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x07' > function='0x0'/> > </disk> > > virtio-scsi - > > <disk type='network' device='lun'> > <driver name='qemu' type='raw'/> > <source protocol='iscsi' name='iqn.2001-04.com.r-dcs03-tgt-1/1> > <host name='11.212.32.52' port='3260'/> > </source> > <target dev='sda' bus='scsi'/> > <address type='drive' controller='0' bus='0' target='0' unit='0'/> > </disk> > <controller type='scsi' index='0' model='virtio-scsi'> > <address type='pci' domain='0x0000' bus='0x00' slot='0x06' > function='0x0'/> > </controller>
There is now support for dataplane in libvirt. See https://libvirt.org/formatdomain.html#elementsIOThreadsAllocation and then you can add an iothread='NN' (NN is a number) to the <driver name='qemu' type='raw'/> element. > second thing, I'm trying to look for the code where QEMU allocate all > guest memory (2 GB) in my case. Start at memory_allocate_system_memory; ultimately you'll reach qemu_anon_ram_alloc which is basically an mmap. paolo
