linux-kernel - Re: Scheduler benchmarks

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Date:   Tue, 18 Aug 2020 23:23:20 +0530
From:   Muni Sekhar <munisekharrms@...il.com>
To:     Greg KH <greg@...ah.com>
Cc:     kernelnewbies <kernelnewbies@...nelnewbies.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: Scheduler benchmarks

On Tue, Aug 18, 2020 at 11:06 PM Greg KH <greg@...ah.com> wrote:
>
> On Tue, Aug 18, 2020 at 11:01:35PM +0530, Muni Sekhar wrote:
> > On Tue, Aug 18, 2020 at 10:44 PM Greg KH <greg@...ah.com> wrote:
> > >
> > > On Tue, Aug 18, 2020 at 10:24:13PM +0530, Muni Sekhar wrote:
> > > > On Tue, Aug 18, 2020 at 8:06 PM Greg KH <greg@...ah.com> wrote:
> > > > >
> > > > > On Tue, Aug 18, 2020 at 08:00:11PM +0530, Muni Sekhar wrote:
> > > > > > Hi all,
> > > > > >
> > > > > > I’ve two identical Linux systems with only kernel differences.
> > > > >
> > > > > What are the differences in the kernels?
> > >
> > > You didn't answer this question, is this the same kernel source being
> > > compared here?  Same version?  Same compiler?  Everything identical?
> > Both systems are having exactly the same hardware configuration.
> > Compiler and kernel versions are different. One system has Ubuntu
> > 16.04.4 LTS(4.4.0-66-generic kernel with gcc version 5.4.0) kernel and
> > the other one has Ubuntu 18.04.4 LTS(4.15.0-91-generic kernel with gcc
> > version 7.5.0).
>
> Those are _very_ different kernel versions, with many years and tens of
> thousands of different changes between them.
>
> Hopefully the newer kernel is faster, so just stick with that :)
But unfortunately the newer kernel is very slow, that is the reason
for starting this investigation :)
Any type of help,  and guidelines to dive deeper will be highly appreciated.

>
> greg k-h



-- 
Thanks,
Sekhar