linux-kernel - Re: Scheduler benchmarks

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Message-ID: <4a20a4bb-0bc7-edb1-bd27-217d8dafe87c@petrovitsch.priv.at>
Date:   Wed, 19 Aug 2020 10:21:50 +0000
From:   Bernd Petrovitsch <bernd@...rovitsch.priv.at>
To:     Muni Sekhar <munisekharrms@...il.com>
Cc:     peter enderborg <peter.enderborg@...y.com>,
        Greg KH <greg@...ah.com>,
        kernelnewbies <kernelnewbies@...nelnewbies.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: Scheduler benchmarks

On 19/08/2020 10:16, Muni Sekhar wrote:
> On Tue, Aug 18, 2020 at 11:45 PM peter enderborg
> <peter.enderborg@...y.com> wrote:
[...]
>> On the 4.4 kernel you dont have
>>
>> +CONFIG_RETPOLINE=y
>> +CONFIG_INTEL_RDT=y
> Thanks! That is helpful. Yes, I see 4.4 kernel don't have the above
> two config options.
> What analysis can be done to narrow down the root cause?
> Any example of reference could be helpful to understand.

I haven't checked the date of the older kernel but Spectre+
Meltdown mitigation costs a lot (20%-30% speed IIRC, out
of the top of my head).

MfG,
	Bernd
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