Re: [Xen-devel] Re: [ANNOUNCE] virtbench now has xen support

[Jan Michael <jan.michael@xxxxxxx>]

Hi Everybody,

On 23.05.2007, at 20:05, Jan Michael wrote:
> The benchmark passed with the following outcome:
>
> Time for one context switch via pipe: 8734 (8640 - 9575)
> Time for one Copy-on-Write fault: 5898 (5814 - 8963)
> Time to exec client once: 573046 (565921 - 615390)
> Time for one fork/exit/wait: 347687 (345750 - 362250)
> Time to send 4 MB from host: 55785000 (27069625 - 315191500)
> Time for one int-0x80 syscall: 370 (370 - 403)
> Time for one syscall via libc: 376 (376 - 377)
> Time to walk linear 64 MB: 1790875 (1711750 - 3332875)
> Time to walk random 64 MB: 2254500 (2246000 - 2266250)
> Time for one outb PIO operation: 721 (717 - 733)
> DISABLED pte-update: glibc version is too old
> Time to read from disk (256 kB): 18810406 (14266718 - 24088906)
> Time for one disk read: 56343 (38593 - 201718)
> DISABLED vmcall: not a VT guest
> DISABLED vmmcall: not an SVM guest
> Time to send 4 MB between guests: 94326750 (79872250 - 729306500)
> Time for inter-guest pingpong: 130316 (119722 - 186511)
> Time to sendfile 4 MB between guests: 134768000 (86528000 - 417646000)
> Time to receive 1000 1k UDPs between guests: 26010000 (23384000 -  
> 66784000)
I didn't had anything to do with benchmarking in the past, and  
especially not with virtualization benchmarks, so there are again  
some questions related to the results of the benchmarking test:
	1. What can I read out of every single value which is listed above?  
Can you please give a short explenation?
        2. What are the unit(s) of the measured values?
	3. What is a good value and what is a bad value? On what does these  
measures depend on - hardware or software or both?
	4. If I get a certain value like this one: Time for one context  
switch via pipe: 8734 (8640 - 9575). What can I do to improve/tune  
the performance or the values?
	5. I googled through the web to find any results to compare with  
mine, but I couldn't find anything. Do you have some?
	6. In the README file is said that virtbench contains "low level"  
benchmarks. What do you consider as a "high level" benchmark?
Ok. Enough of my questions so far. If you answere these ones I'll may  
be have more afterwards.
Thanks for your help,

	Jan 

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