linux-kernel - Re: [PATCH 0/7] selftests/resctrl: Add resctrl selftest

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <feb572ec-4495-c52c-0127-213417a67c3c@amd.com>
Date:   Wed, 17 Oct 2018 18:28:30 +0000
From:   "Moger, Babu" <Babu.Moger@....com>
To:     "Prakhya, Sai Praneeth" <sai.praneeth.prakhya@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, H Peter Anvin <hpa@...or.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        James Morse <james.morse@....com>,
        "Pathan, Arshiya Hayatkhan" <arshiya.hayatkhan.pathan@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/7] selftests/resctrl: Add resctrl selftest



On 10/17/2018 12:28 PM, Prakhya, Sai Praneeth wrote:
>>> No, the selftest in this patch set will not replace intel-cmt-cat or
>>> vice versa.
>>>
>>> The selftest in this patch set has a different purpose from intel-cmt-cat:
>>> the selftest is a test tool which validates resctrl functionalities
>>> while intel-cmt-cat is mainly a utility that provides base library for
>>> higher level applications including performance analysis tools,
>>> benchmark measurement tools, and potential resctrl tests. For example,
>>> running MBA test in the selftests tells MBA working or not working
>>> (fail/pass) right way. The
>>
>> Ok. Sure. Let me take a look at selftest closely. Will send my feedback soon.
> 
> Great!
> 
>>
>>> intel-cmt-cat doesn't have this testing capability unless we extend
>>> the tool.
>>>
>>> And intel-cmt-cat is maintained and developed by Intel. I don't think
>>> it's easy to extend it to AMD and ARM features. The selftest will be
>>> maintained
>>
>> We1l.. We were hoping to have a common tool across. It makes it easy for
>> distros. Probably, we can have a separate discussion on this.
>>
> 
> The main goal of this test suite is to validate values reported by resctrl features 
> i.e. we need _some_way_ to check if values reported by resctrl features are 
> correct or not.
> 
> For (Intel) Memory Bandwidth features like MBA and MBM, perf iMC 
> (Integrated Memory Controller) is used for validation. As a part of test, we run a 
> benchmark (eg: fill_buf) and get memory bandwidth values from MBM and iMC 
> and verify if the difference between both the reported values are in a reasonable range.
> 
> To make this common across x86, could you please let us know if similar things 
> (i.e. perf iMC) exist on AMD? If so, you could add it in. The same applies for ARM.

We dont have iMC. You can go ahead with what you have right now. We can
add those details later if required.

> 
> Regards,
> Sai
>