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

[Brian Wolfe <brianw@xxxxxxxxxxxx>]

Have you tested mysql on iSCSI disks? If not I can do so using athlon
2000+ xen host and iscsi target servers over 100Mbps ethernet if you can
toss me your testing scripts. :)


On Mon, 2005-01-24 at 23:22 +0000, Ian Pratt wrote:
> > 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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> 
> 
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