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Re: [rhelv6-list] Kernel errors under kvm guest using e1000



On 20 April 2011 11:27, carlopmart <carlopmart gmail com> wrote:


Yes I have tested using RHEL6 guest with virtio_net and performance is very close (not equal, of course) to a real 1GB network.

On this guest is imperative to use 1GB nic driver, I can't work with a 10MB nic driver like pcnet or ne2k_pci or rtl8139 ...


So you think the virtual ne2k_pci or rtl8139 limit the bandwidth to the same as the driver for real hardware? Or, for that matter, that virtio_net is limiting the speed to 1GB?

You should find that guest to guest communication through virtual interfaces is limited by the performance of the host and guest to external machine is limited by the minimum of the raw machine performance and the physical NIC.   Is this not the case?

Here I get about 80MB/s between guests (admitedly using xen rather than kvm, but the principle is the same) even though the emulated NIC says 100Mb/s, which is rather less than the 700Mb/s I'm actually getting.  (This is not a particularly quick machine either and in fact I'm limited by how quckly I'm pulling data off a disk, the maximum attainable speed without that is much, much greater).

jch

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