Re: [Xen-users] [Fwd: XCP - extreme high load on pool master]

[Vern Burke <vburke@xxxxxxxx>]

Thousands of VMs on a single XCP pool? It's just my opinion of course 
but I wouldn't try to run 100:1 (or worse) virtualization ratios unless 
you're running 12 cores (and a ton of memory) or better in a box.
Keep in mind that the pool master is doing a ton of work for the entire 
pool, which explains why its load is higher than the slaves. In my 
cloud, I generally reserve the pool master for admin work rather than 
running production workloads on it.
The reason for this is that there's still an ongoing bug in XCP's 
developers console that you can only connect to the console of a VM 
that's running on the pool master. Try to connect to a VM that's on any 
of the slaves and you get just a blank white window.

Vern Burke

SwiftWater Telecom
http://www.swiftwatertel.com
Xen Cloud Control System
http://www.xencloudcontrol.com


On 7/21/2010 4:13 PM, George Shuklin wrote:
> Good day.
>
> We trying to test XCP cloud under some product-like load (4 hosts, each with 
> 24Gb mem and 8 cores)
>
> But with just about 30-40 virtual machines I got an extreme load on dom0
> on pool master host: LA is about 3.5-6, and most time are used by xapi
> and stunnel processes.
>
> It's really bother me: what happens on higher load with few thousands of
> VMs with about 10-16 hosts in pool...
>
> top data:
>
> Tasks:  95 total,   3 running,  91 sleeping,   0 stopped,   1 zombie
> Cpu(s):19.4%us,42.1%sy,0.0%ni,35.8%id,  1.3%wa,  0.0%hi,  1.0%si, 0.3%st
> Mem:    746496k total,   731256k used,    15240k free,    31372k buffers
> Swap:   524280k total,      128k used,   524152k free,   498872k cached
>
> PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+ COMMAND
> 17  -3  315m  14m 5844 S 52.3  2.0   5370:41 xapi
> 17  -3 22524  15m 1192 S  8.3  2.2 875:16.18 stunnel
> 15  -5     0    0    0 S  0.7  0.0  54:28.78 netback
> 10 -10  6384 1868  892 S  0.3  0.3  22:03.14 ovs-vswitchd
>
> dom0 on non-master hosts are loaded about 25-30% each.
>
>
>
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