Re: Xen in a production environment
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I have not used Xen (I use qemu for testing other OS's). I am just curious
to know how much of overhead do the guest OS's create on the host OS even
when the resources are _separate_.
Regards,
rrs
R. W. Rodolico on Wednesday 30 Nov 2005 06:40 wrote:
> Am not using it in production, but do have xen 3 beta installed.
>
> I did install xen 2, but it uses the older 2.6 kernel with had some
> problems with some of the newer hardware. You are pretty locked into
> the kernel they have modules for, but when I got it installed, it
> was pretty sweet. I used loopback mounted files for my devices,
> which is likely not the optimum solution, but it worked pretty well.
> On a 2GHz Athlon with 2G of RAM, I allocated 512M for each of three
> virtuals and the remainder to Domain0. When I fired them all off, it
> was pretty good, ie it felt like four 500M Hz computers.
>
> That being said, when a domain has been idle for a while, it does
> take a noticable amount of time for it to wake up and take its share
> of the cpu. I let one stay idle for a while (while the others were
> kept busy), then fired off a process. Seems like it took a second or
> two for it to say "Hey, I want some cycles also" and over a period
> of around 30 seconds or so it seemed to slowly gain speed as it took
> more and more cycles. I know there are some parameters than can be
> tweaked to modify some of this behavior
>
> Like I said, have not done it in production the way you are talking
> about. I think it would be worth checking into, however, if you have
> a lot of domains that don't do much most of the time. And, from what
> I've read, when Xen 3 is stable, you can get an Athlon 64 and a lot
> of the task switching is done in the CPU, so that will be very, very
> nice.
>
> Rod
>
>
>
>
> Simon said:
>> Hi There,
>>
>> Wondering if anyone has used or is using Xen (open-source
>> virtualization) in a production environment? Any comments if so?
>>
>> (for virtual hosting services)
>>
>> Simon
>>
>>
>
>
- --
Ritesh Raj Sarraf
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