RE: [Xen-ia64-devel] [IPF-ia64] with Cset 10690, creating a VTImake xen0 hang

[Alex Williamson <alex.williamson@xxxxxx>]

On Tue, 2006-07-11 at 19:42 +0800, Zhang, Xiantao wrote:
> Hi Alex,
>       Seems this issue was caused by Cset 10688. In vcpu_itr_d, the current
> logic purges vhpt with cpu_flush_vhpt_range but it is very heavy to
> xen0. When creating VTi domain @ early stage, IO operation is very
> excessive, so qemu was scheduled out and in very frequently and this
> logic was executed every time. In addition, cpu_flush_vhpt_range using
> identity map to purge vhpt may cause more tlb miss due to no TR map.
> If remove vcpu_flush_tlb_vhpt_range logic although it definitely
> needed, seems VTi becomes healthy. Maybe potential bugs exist there.:)

   Thanks for investigating Xiantao.  Isaku, any thoughts on how to
regain VTI performance?  Thanks,

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


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