Am 10.11.2012 14:41, schrieb Mark Nelson:
On 11/10/2012 02:03 AM, Stefan Priebe wrote:
Hello lists,
on a dual Xeon KVM Host i get max 6000 IOP/s random 4k writes AND reads.
On a Single Xeon KVM Host i get 17.000-18.000 IOP/s write and read. I
already tried to pin the kvm process using numactl and also the fio
process but it doesn't help on the dual xeon.
10GBE Network is fine. I get 9.8Gbit/s on both hosts. Kernel is also he
same on both.
Anybody an idea?
When you say KVM host, do you mean the underlying node or the virtual
machine instance?
Sorry i'm talking about the vm host regarding the HW. The vm instance is
always the same.
If you mean underlying node, it could be remote memory access or if you
are on a last gen xeon if you have dual io hubs, you could be hitting a
remote io hub for the network card. I wouldn't think that would cause
such a big hit, but those are things to look into.
I'm on E5-Xeon. What means io hub?
Stefan
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