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

[Christoph <mangel@xxxxxx>]

Am 2015-09-01 20:39, schrieb Grzegorz Bakalarski:
> IOMMU is advanced BIOS setting (you nay check BIOS settings during 
> boot).
aa you mean VT-d? its on here but I dont use it, all my domU's are PV 
domU's
> 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 ...
it was a centos kernel

> Other thought - IP packet fragmentation ...
>
> GB
but I have new Infos, I have installed a new kernel 
4.1.6-1.el6.elrepo.x86_64 and the problem is gone!
the original centos6 kernel seems to have some nfs/io issues 
(kernel-2.6.32-573.3.1.el6.centos.plus.x86_64)
have tried nfs server with other domU sentos7 based and there is all ok 
to...
so, dont use centos6 domU's on centos7 dom0 (or use a newer kernels)

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Greetz

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