Re: [Xen-users] Optimizing I/O

["Ryan Burke" <burke@xxxxxxxxxxxxxxxxx>]

>> On Jan 21, 2009, at 4:07 PM, lists@xxxxxxxxxxxx wrote:
>>
>>> Anyone have any tips on optimizing CentOS for best I/O when it's being
>>> used as a xen server.
>>>
>>> Mike
>>
>> I don't know about just I/O but in general I do;
>>
>> /etc/grub
>>
>> after the kernal line at the end add dom0=512M
>> after the module vmlinuz at the end of that line add nosmp
>>
>> then in /etc/xen/xend-config.sxp add
>> (dom0-min-mem 0)
>>
>> These mods have made my dom0 no longer pause at wierd times of the day
>> and
>> allow faster performance of my domUs.
>>
>> - Brian
>>
>
> But won't adding "nosmp" make your server only use 1 CPU(-core)?
> Seems like a terrible waste.
>
> Regards,
> Vidar
>


It will only make the Dom0 1-core. Most people pin their Dom0 to a
dedicated core so there is no reason to enable the smp code if you know
you are only using 1 core.

Ryan


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