search for: z840

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2016 Apr 10
2
CentOS7, Xen 4.6.1, kernel 3.18.25-19 strange performance problem
...16 threads: real 1m41.983s user 16m37.247s sys 5m7.121s 32 threads: real 1m29.240s user 23m7.170s sys 6m31.497s kernel 3.18.25-19 16 threads: real 1m12.909s user 14m37.627s sys 1m36.521s 32 threads: real 1m0.530s user 18m45.569s sys 1m58.807s Some notes: - System is a HP z840 with 2*8core E5 v3 Xeon and 128gig Ram. Disk is an Intel 750 ssd (PCIe nvme) - While normally in Xen, I limit Dom0 Memory via dom0_mem, but for the tests, Dom0 was allowed to use full memory - While running the test, no guest was running except Dom0. System was booted to graphical desktop and wa...