Re: [Xen-devel] Read Performance issue when Xen Hypervisor is activated

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

.
> time dd if=/dev/zero of=datei bs=1M count=10240
>   Without Xen (baremetal Linux)   With Xen (from within dom0)
>        73.7224 s, 146 MB/s            97.6948 s, 110 MB/s
>             real 1m13.724s                 real 1m37.700s
>              user 0m0.000s                 user  0m0.068s
>              sys  0m9.364s                 sys  0m15.180s
> 
> 
> root@Zhaman:~# time dd if=datei of=/dev/null
>   Without Xen (baremetal Linux)   With Xen (from within dom0)
>        9.92787 s, 1.1 GB/s            95.1827 s, 113 MB/s
>              real 0m9.953s                 real 1m35.194s
>              user 0m2.096s                 user 0m10.632s
>               sys 0m7.300s                  sys 0m51.820s
> 
> Which confirms that, when running the tests inside a Xen Dom0, things
> are indeed slower.

.. and which PVH should fix. Also 'dd' sucks for benchmark, pls
use 'fio' which more consistently checks storage speeds.

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