RE: [Xen-devel] MYSQL bechmark results on XEN and NFS

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I am trying to setup mysql on XEN.  I need to set it up on 
> NFS so I can migrate the domain when needed.

I'd use GNBD rather than NFS in situations where performance matters. 

Also, you should be using 2.0-testing for benchmarking purposes until we
push out 2.0.4, as the default kernel config had debugging turned on in
2.0.1-3.

Ian

>  
> 
> I am getting unexpected results and wanted to get some feedback.
> 
>  
> 
> Here is my setup:
> 
>  
> 
> 1.    NFS server
> 
> Dual 2.0 Ghz  AMD Opteron
> 
> 2GB of RAM
> 
> Broadcom GB NIC
> 
> Standard Fedora Core 3 (FC3)
> 
> Mysql w/tpc-c medium databases on the NFS share
> 
> XenU filesystem on the NFS share
> 
>  
> 
> 2.    Xen machine
> 
> Dual 2.0 Ghz  AMD Opteron
> 
> 2GB of RAM
> 
> Broadcom GB NIC
> 
> FC3 w/XEN kernel patch
> 
> Dom0 = 512MB RAM
> 
> DomU = 512MB RAM
> 
>  
> 
> 3.    TPC-C client
> 
> PIII 2.0 Ghz 
> 
> 512 MB RAM
> 
> Standard Fedora Core 2
> 
> TCP-C client
> 
>  
> 
> Results using the tpc-c benchmark: 
> 
> Baseline ~3300 new-ops per second
> 
>             Machine 2 booted to the standard FC3
> 
> Xen0 ~ 1700 new-ops per second
> 
>             Machine 2 booted to Xen kernel with 512MB of RAM
> 
> XenU ~500 new ops per second
> 
>             Machine 2 booted to Xen kernel with 512MB of RAM
> 
>             DomU booted from NFS share with 512MB of RAM
> 
>  
> 
> Am I missing something here or is that much degradation 
> expected when booting a virtual machine over NFS.
> 
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