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KVM provides paravirtualization drivers for several bits of hardware; this particular one is the memory balloon driver. In particular, you should see virtio_net when using the virtio network drivers, and virtio_blk when using the block device (disk) driver. And in the latter case, your disk would be /dev/vda instead of /dev/sda. In your case, the virtio ...


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As you can see you have: CONFIG_VIRTIO_BALLOON=m It means it is compiled as a module, hence visible via lsmod. Furthermore, you have: CONFIG_VIRTIO_BLK=y CONFIG_VIRTIO_NET=y It means that they are compiled within the kernel, hence lsmod does not report them. So your guest has the virtio drivers for: blk: block devices, aka disks; net: network ...


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The virtio drivers are meant to provide paravirtualized hardware (acceleration) device drivers to virtual machine guests. As such, they are device drivers that are installed in the guest operating system, not on the host. You can find the virtio drivers for Windows from the KVM web site.


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Your KVM instances should be able to saturate your hosts network connection with no issues. My first recommendation here is to upgrade both the host and guest's kernel. The stock CentOS 6.5 kernel does not have great performance for KVM. I'd suggest kernel-lt from ELRepo (or kernel-ml if you're feeling brave). This should give you a decent boost in ...


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As @Michael Hampton pointed out, you can download the drivers from the offsite. The RPM is just a wrapper around a set of .vfd and .iso files, containing the drivers, it doesn't do anything on the host besides copying those files so they are available. In short, you don't really need the RPM.


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Yes, you can download the drivers from the upstream KVM project.



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