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

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 ...


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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