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

[Grzegorz Bakalarski <g.bakalarski@xxxxxxxxxx>]

Tell us hardware (server nmanufacturer, BIOS version and BIOS settings, 
especially IOMMU ...
Do you use kernel with NUMA?

GB


W dniu 2015-09-01 19:14, Christoph napisaÅ(a):
> > 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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