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1132300
2017 Nov 14
2
dramatic performance slowdown due to THP allocation failure with full pagecache
Hi all,
This is not really a libvirt issue but I'm hoping some of the smart folks
here will know more about this problem...
We have noticed when running some HPC applications on our OpenStack
(libvirt+KVM) cloud that the same application occasionally performs much
worse (4-5x slowdown) than normal. We can reproduce this quite easily by
filling pagecache (i.e. dd-ing a single large file to