From: Brian Woods <brian.woods@amd.com>
To: xen-devel@lists.xen.org
Cc: Andrew Cooper <andrew.cooper3@citrix.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Brian Woods <brian.woods@amd.com>,
Jan Beulich <jbeulich@suse.com>,
Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Subject: Re: [PATCH 0/2] x86/svm: add pause filtering threshold for SVM
Date: Tue, 20 Feb 2018 18:17:30 -0600 [thread overview]
Message-ID: <20180221001730.GA18409@amd.com> (raw)
In-Reply-To: <20180221001233.62644-1-brian.woods@amd.com>
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HW Setup:
CPU: AMD EPYC 7401 24c/48t x 2
RAM: 128GB RAM
Storage: HDD for dom0, SSDs for VMs
SW Setup:
Xen base 4c7e478d597b0346eef3a256cfd6794ac778b608
32 VMs
6 VPCUs per VM
3.5GB RAM per VM
7.5GB disk per VM
Results:
kernbench:
half -> -j vpcu/2 = one job per host thread
quad -> -j vpcu*4 = two VMs per host thread,
four jobs per VM VCPU
pi:
03 -> 3 in parallel = one pi per host thread
24 -> 24 in parallel = two VMs per host thread,
four pis per VM VCPU
Kernbench: https://github.com/linux-test-project/ltp/blob/master/utils/benchmark/kernbench-0.42/kernbench
pi: based off of https://stackoverflow.com/questions/4084571/implementing-the-spigot-algorithm-for-%CF%80-pi
but with yields and 10ns sleeps added in.
Between the current usage of pause filtering counter, there's about an
~.5% improve in performance. While this isn't huge, all that's
required is to write a value in the VMCB.
Attached:
elapsed_time_kernbenchhalf.pdf
elapsed_time_kernbenchquad.pdf
elapsed_time_pi03.pdf
elapsed_time_pi24.pdf
--
Brian Woods
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next prev parent reply other threads:[~2018-02-21 0:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-21 0:12 [PATCH 0/2] x86/svm: add pause filtering threshold for SVM Brian Woods
2018-02-21 0:12 ` [PATCH 1/2] x86/svm: add support for pause filtering threshold Brian Woods
2018-02-21 17:36 ` Moger, Babu
2018-02-23 9:44 ` Jan Beulich
2018-02-21 0:12 ` [PATCH 2/2] x86/svm: enable " Brian Woods
2018-02-21 17:36 ` Moger, Babu
2018-02-21 0:17 ` Brian Woods [this message]
2018-02-21 23:30 ` [PATCH 0/2] x86/svm: add pause filtering threshold for SVM Boris Ostrovsky
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