Re: What are KVM guest cores?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


> Do you have a rule of thumb as to how many core to assign
> to a guest?  For instance, with an Intel x5650 with 6 real
> and 12 hyperthreaded cores, how many cores would you assign
> to the guest?

It fully depends on the load of your guests and how many guests you
want/need to run on a single server.

You need to perform some testing to know what will work the best in
your case. One thing to remember though: In your case, if you create
two guests with 12 virtual CPUs each, and one of them crashes and take
all its 12 virtual CPUs up to 100%, it will essentially take most of
the processing power away from the second guest, leaving the second
guest in a close-to-useless state (depending on your scheduler, but
you get the point). If you on the other hand had assigned 6 cores to
each of them, the second guest would have remained unaffected, since
it just uses the 6 cores with no load. So if your guest will not
utilize the extra CPUs anyway, then don't assign them.

Best regards
Kenni
_______________________________________________
CentOS-virt mailing list
CentOS-virt@xxxxxxxxxx
http://lists.centos.org/mailman/listinfo/centos-virt



[CentOS Users]     [Linux Media]     [Asterisk]     [Photo]     [DCCP]     [Netdev]     [Xorg]     [Xfree86]     [Devices]     [Linux USB]

Powered by Linux Add to Google