Re: FreeBSD 9.1 vs CentOS 6.3

On 3/23/13 3:44 AM, Davide D'Amico wrote:
> Il 23.03.2013 01:34 Paul Pathiakis ha scritto:
>> Hi,
>>
>> There are several things about this that are highly suspect.
>>
>> First, wipe out the hardware RAID. The processor doing RAID
>> computation is, probably, MUCH slower than a core on the CPU. Even if
>> it's RAID-1 (Simple Mirror) this RAID card is performing tasks that is
>> does not need to do including replicating writes to two targets from
>> the controller or checking it's cache, battery, etc. If it's possible
>> to disable the onboard cache, do it.
>
> Hi Paul,
> thanks for your suggestions (some of them I've applied before starting 
> any consideration, like disabling all on-disk caches or controller 
> buffers) I'll try next monday.
>
> Anyway, the fact is that using the same hardware configuration 
> (raid1+raid10) I saw that a centos 6.x outperformed freebsd 9.1.
> Another test I made yesterday was: on the same hardware I installed 
> vmware esx 5.x and created a vm with centos inside it. The result was 
> really impressive: the centos vm outperformed the 'real' freebsd 9.1 
> too and checking vmware performances graphs I didn't see any huge need 
> for a massive throughput (I saw values from KBps to 10MBps), instead I 
> saw a big use of CPU (using OLTP tests with a concurrency of 32 
> threads it's performaces began to slow down).
>
So, what happened when you installed FreeBSD 9.1 in the VM? How did the 
'fake' FreeBSD 9.1 compare 1) to the 'real', and 2) to either of the 
CentOS installations?

-bt
> I don't know is using some magic value for HZ or setting some trick 
> with scheduler, I could gain something: I hope so, because I don't 
> want to "pinguinate" my farm :)
>
> Thanks,
> d.
>
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