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

[Grzegorz Bakalarski <g.bakalarski@xxxxxxxxxx>]

W dniu 2015-09-01 20:13, Christoph napisaÅ(a):
> it seems that the nfs domU is the problem, it is the whole time on 100% 
> io...
> it is a self made home server with an Intel (DX58SO) Board, BIOS ver
> SOX5810J.86A.5390.2010.0614.1053 (AFAIK last one) with Intel i7 920
> CPU with 2,67GHz and 12GB RAM
>
> how can I check the IOMMU/NUMA Infos?
>
> Am 2015-09-01 19:44, schrieb Grzegorz Bakalarski:
> > Tell us hardware (server nmanufacturer, BIOS version and BIOS
> > settings, especially IOMMU ...
> > Do you use kernel with NUMA?
IOMMU is advanced BIOS setting (you nay check BIOS settings during 
boot).
NUMA is kernel compilation option. If you did not compile kernel 
yourself, probably you has NUMA on. You may try to boot kernel with NUMA 
off (or recompile) ( but I dont think NUMA is important if you have 
single i7 920 CPU ...
Other thought - IP packet fragmentation ...

GB

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