Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Tue, 18 Aug 2020 19:36:56 +0200
From:   Greg KH <greg@kroah.com>
To:     Muni Sekhar <munisekharrms@gmail.com>
Cc:     kernelnewbies <kernelnewbies@kernelnewbies.org>,
        linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org
Subject: Re: Scheduler benchmarks
Message-ID: <20200818173656.GA748290@kroah.com>
References: <CAHhAz+inPwKYx_4qaujQ=bGG9twashiuqLhQQ-+vgHWF7FLhRA@mail.gmail.com>
 <20200818143633.GA628293@kroah.com>
 <CAHhAz+hG5kS5rhph4SaSLOEc5PgcSOTPWpiANLNpwotY9Zy6qQ@mail.gmail.com>
 <20200818171457.GA736234@kroah.com>
 <CAHhAz+ggd4DPFfWPB+h6Obkjebf5mv5cV6307oKEkEYMhAB3wQ@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <CAHhAz+ggd4DPFfWPB+h6Obkjebf5mv5cV6307oKEkEYMhAB3wQ@mail.gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@kroah.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@kroah.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