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<think>
Okay, so I need to classify this bug report into one of the given categories. Let me read through it carefully.
The user is reporting an issue with QEMU's network model rtl8139 causing a lot of collisions and low transfer speeds. They tested with brctl and Open vSwitch, thinking maybe it was a switch problem, but changing to virtio NIC made everything work fine.
So the main points are: usingrtl8139 leads to performance issues, while virtio works well. The host is Ubuntu 16.04.2 LTS, guest is Ubuntu 14.04.5 and 16.04.2, both affected except when using virtio.
Looking at the categories: network seems relevant here because it's about NIC models and network performance. Other options like device or graphic don't fit as well. It's not a translation issue (mistranslation), nor is it assembly related. The problem isn't with the hypervisor, kernel, or permissions directly but rather the network model.
Therefore, the category should be 'network'.
</think>
network
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