Host Link link Guest speed speed limit

Hello..

It is a Question: is somehow the link speed of the host not to limit the speed of the link of a guest (VM) access the HOST?

Example:

What happens if we have a host that is equipped with a 100 Mbit NETWORK card and a guest who has a virtual 1 GB card NIC (Intel Pro 1000 thingy). OF COURSE the guest CANNOT reach the external network (Physics) with the speed of 1 GB or vice versa since its limited through the physical NETWORK adapter of the host...

BUT... The Question now is... WHAT the maximum performance of such a guest if we want fair access network-HOST Services itself? It is a local connection, I guess. What speed can be achieved here?

Background:

I have here a host FAT on Ethernet 100Mbit, 16Gig RAM, 2 x Intel XEON CPUs, Debian 5.0.1 and VMWARE 2.0.1 4core. My guest inside is also Debian 5.0.1 with a 100mbit NETWORK card PCnet32 virtual thingy. My host can read data from local raid with about 120 MB/s (mega bytes/s). My guest (using iSCSI to enter the Volumes on the host and so using the internal virtual network) can read about 11.2 MB/s of the host Diskdrives.  It made me courious, since ~11.2MB/s is on a 100mbit NIC maximum flow. But it is a BIG difference on performance. BTW: the same client can access data files of local virtual disk of GIS (vmdk) by AT LEAST 120 MB/s (local caching disabled). So, where is the limit and the bottleneck?

Any ideas/suggestions?

Axel Werner wrote:

And now you tell me... that the Networking Performance between guest and host VMWARE here is this effect limited to 100 Mbps, because I don't meet with the host NIC (which takes place in)

100 Mbit)?

Yes.

But COMMENTS <>network HOST my NIC speed would not be limited if I'd put the guest in a virtual network "HOST ONLY"?

Yes.

If Yes... WOW! But... what would look like if you have Clients who want to access the Guest VM as a server files to a configuration/solution? you will need some sort of routing/bridging again.

N °

Oh... would be 2 NICs in this guest so be a good solution? like: < USER-BRIDGED-LAN >--< GUESTVM > [NIC2]-< HOSTONLYNETWORK >

Yes.

If the GUEST VM by wire-speed, users can access and GUESTVM access HOST of Services at the speed of the cpu. Is this correct?

I didn't say CPU speed, I said, it depends on the speed of the CPU. But in general, Yes.

If you found this information useful, please consider awarding points to 'Correct' or 'Useful' responses Thank you!!

AWo

VCP / vEXPERT 2009

Tags: VMware

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