linux-kernel - Re: Scheduler benchmarks

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Message-ID: <20200818173656.GA748290@kroah.com>
Date:   Tue, 18 Aug 2020 19:36:56 +0200
From:   Greg KH <greg@...ah.com>
To:     Muni Sekhar <munisekharrms@...il.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 11:01:35PM +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 :)

greg k-h