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Re: [Xen-users] High Oracle overhead with Xen 4.1.2

On Thu, Mar 15, 2012 at 8:21 PM, Fajar A. Nugraha <list@xxxxxxxxx> wrote:
> On Fri, Mar 16, 2012 at 8:00 AM, AP <apxeng@xxxxxxxxx> wrote:
>> Config 1:
>>  b) 1 Guest running Oracle with 12 GB memory and 4 vcpus
>>  c) 1 Guest running HammerOra 2.9 with 1 GB memory and 2 vcpus
>> Config 2:
>> - H/W: 12 GB memory (memory was reduced using the kernel command
>> line),  4 CPU (Intel(R) Xeon(R) CPU E5606  @ 2.13GHz)
>> - OS: CentOS 5.6 (Linux 2.6.18-238.el5)
>> - Software: HammerOra 2.9 (Load Testing Tool) against Oracle
> So in config 1 you put the benchmark in different domU?
> To narrow down possible problems, I suggest you put it in the same
> domU first, so the config will be identical to bare metal. Also make

I tried that and it made no difference.

> sure that both bare metal and the domU are running from the same block
> device (kinda tricky, but possible if you use UUID or LABEL).

Yeah, that is a little tricky for me to pull off though I am using
identical disks for the both tests. Plus I don't know how much that
will help as most of the stuff was in memory (tmpfs) and hence IO
shouldn't be that much of an issue. So what I am concerned about is
the heavy 30-40% hit with Xen being predominantly CPU and memory


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