Re: [Xen-users] poor IO performance with dom0 on centos7

[Christoph <mangel@xxxxxx>]

> Can you use fio/iperf (or similar tools) to pin down the issue? Without
> knowing which component is causing the performance degradation there's
> no way we can provide a solution.
>
> I would recommend to measure network throughput between VMs (satan and
> levaithan), between VMs and Dom0 and finally between VMs and another
> host on the same network.
>
> Roger.
hmmm it seems to be the IO the problem:

 TID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND
 2248 be/4 root        0.00 B/s  403.41 K/s  0.00 % 97.00 % wget 
http://cdimage.debian.org/cdimage/weekly-builds/amd64/iso-dvd/debian-testing-amd64-DVD-3.iso
my inet download rate is 100Mbit then I see with wget ~10mb/s download 
then it stops after a while, then it goes again on nearby 100% io for 
some time and stops again and and and...
is there something what I can do? (except buy a new hardware :) )

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Greetz

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