Hi
I agree with David Martin, all my VM machines are 1vCPU (except for my
Citrix XenApp farm).
With 8 vCPU's will may be seeing lots of other side effects, to do with
resource scheduling. What physical hardware are you using?? I think
you may need to look at how your VMware farm/servers are configured, as
you may have bigger problems than just ZLB.
Thanks
Nick
>>> "Jaume Ponsa" <[email protected]> 08/02/2012 12:53 >>>
I was planning to manage 3 real servers behind ZLB and 600 concurrent
petitions...
not necessary 8 cpu's?
When cpu is 100% can't access machine, so can't type "top"
Jaume Ponsa
Sistemes i Xarxes Inf. Calidae, S.L.
[www.calidae.net] - [email protected]
tel +34 938654433 fax +34 938651973
El 08/02/12 13:27, David Martin (IT) escribió:
> Is there a performance reason why you have 8 vCPUs assigned to the
VM?
> Unless you are planning an absolutely massive load-balance pool that
can
> actually use this arrangement you should drop this considerably
> according to VMWare best practice.
>
> My understanding is that, every time you introduce another vCPU, the
> overhead for context-switches, register flushes, synchronisation and
the
> like increases considerably, especially when you are spreading the
vCPUs
> across different dies.
>
> Unless you have applications that absolutely have to have access to
the
> CPU power, you really want to cut the cores to the bare minimum. Try
> starting with 1vCPU and 4GB RAM and work your way up until you start
to
> hit performance limits.
>
> Also, when you are seeing 100% CPU usage, what does the output of
the
> "Top" command show?
>
> Regards
>
> David
>
>
> -----Original Message-----
> From: Jaume Ponsa [mailto:[email protected]]
> Sent: 08 February 2012 10:28
> To: '[email protected]'
> Subject: [Zenloadbalancer-support] question
>
> Hello all... I have one testing v2RC1 installation on a vmware
virtual
> machine.
>
> I have no more traffic (only tests) and I don't know why, 2 times,
> system hangs ..... the reason is cpu becomes 100% usage and system
> becomes unusable.... can anyone help me pleas?
>
> I don't think will be a hardware problem, because i have other
machines
> running perfectly, and for this Zen machine I reserved 4Gb RAM and 8
CPU
> Xeon E5620
>
> I installed ther kernel 2.6.32-5-686-bigmem to allow more than 4Gb
RAM
> (in future I'll assign 16Gb ). May be have to install
> linux-image-2.6.32-5-vserver-686-bigmem kernel???
>
> Thanks
>
> --
> Jaume
>
>
>
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