[Slackbuilds-users] Suggestion for qemu-kvm slackbuild

[Stu Miller]

On 18.02.2012 13:10, Adis Nezirovic wrote: 

> Can we add the
following line to udev rules (fixup_udev_rules.patch):
> 
>
+KERNEL=="vhost_net", GROUP="@GROUP@", MODE="0660"
> 
> so that both,
/dev/kvm and /dev/vhost_net devices are group-owned by
> kvm group (or
@GROUP@)
> The defaults for /dev/vhost_net are root:root 600
> 
> The
idea is that one can run qemu-system-x86_64 as ordinary user, and
> use
vhost_net acceleration using netdev syntax:
> 
> -netdev
type=tap,ifname=tap0,id=guest0,script=no,downscript=no,vhost=on 
>
-device virtio-net-pci,netdev=guest0,mac=XX:YY:XX:YY:XX:YY
> 
> tap0
device is precreated in rc.bridge script (tunctl -g kvm -t tap0),
> so
nothing requires root privileges for running VM.
> 
> Best regards,
>
Adis
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I had some time over the weekend to
check out qdev and vhost_net and I like what I've found so far. I
reconfigured a non-critical, production KVM (slackware-13.37) to run
vhost_net and the network latency on pings is 50% of the non-vhost_net
KVMs. I'll keep the KVM running in this config and watch performance and
stability. So far I support this recommendation and will add it to the
next qemu-kvm SlackBuild if my KVM survives my soak test. 

Thanks for
the suggestion! 

Stu 
 
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