Re: [Xen-devel] xen vs. uml benchmarks

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>]

> Hi,
> 
> I have a question about the benchmarks published on the Xen website, mainly
> how UML was benchmarked. My point is that the details aren't described
> anywhere, and there are several tricks which dramatically improve UML
> performance, mainly IO-Latency and scheduling. 

The SOSP paper contains more details. 

The UML was running with the SKA host patches.

> So, here comes:
> - what was the data, such as rootfs, in reality? was it a raw partition or an
>   ubd or hostfs (or whatever)?

The root file system and all data were stored in a real (raw) disk
partition containing ext3. 

> - was the UML memory saved on tmpfs?

No special measures were taken to control where the UML memory
went, as I'm afraid the UML howtos didn't indicate that this was
important.  If the default is to send it to /tmp (?), that would
have been the host's root ext3.

If I get a chance, I'll rerun the UML results with a tmpfs.

> - was swap used inside the guest, again was it raw or ubd or whatever?

None of the experiments caused the guests to swap, so I believe
swap was left unconfigured (I haven't got access to the machine
right now to check)

Best,
Ian
 
> Anyway, Xen benchmarks look very impressive.
> 
> Bye,
> 
> Peter Surda (Shurdeek) <shurdeek@xxxxxxxxxxxx>, ICQ 10236103, +436505122023
> 
> -- 
>                 NT, now approaching 23x6 availability.
> 
> 
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