cross compilation

cross compilation

[Shyam Saini]

Hi all,

I'm trying to figure out optimized code for some network drivers. I'm
replacing certain APIs in the code and compare code for each API.

To choose best optimized code, i need to first compile them and then
disassemble  the compiled code, where a change in single line would make a
significant difference in
the performance.

So, my question is how to compile* x86 based network drivers  on x86_64
Ubuntu machine*. Currently I'm running Ubuntu 14.04.

Please help me out


Thanks
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cross compilation

[Valdis.Kletnieks at vt.edu]

On Tue, 07 Jun 2016 02:27:03 +0530, Shyam Saini said:

> To choose best optimized code, i need to first compile them and then
> disassemble  the compiled code, where a change in single line would make a
> significant difference in the performance.

Note that due to things like cache line misses, looking at the code will
tell you almost nothing about which is *really* the "best" code...

> So, my question is how to compile* x86 based network drivers  on x86_64
> Ubuntu machine*. Currently I'm running Ubuntu 14.04.

Why do you need to cross-compile?  Just build the drivers as x86_64.  Pretty
much anybody who actually *cares* about performance has moved off 32-bit
kernels a while ago (unless you're stuck with an embedded 32-bit CPU).
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cross compilation

[Shyam Saini]

> Note that due to things like cache line misses, looking at the code will
> tell you almost nothing about which is *really* the "best" code...

I thought of counting number of instructions in disassembled code for each
case. Since I'm only replacing certain API's , rest of the code remains
same.

For example
Replacing ACCESS_ONCE() API with READ_ONCE()

Please correct me , if I'm wrong.

> Why do you need to cross-compile?  Just build the drivers as x86_64.
Pretty
> much anybody who actually *cares* about performance has moved off 32-bit
> kernels a while ago (unless you're stuck with an embedded 32-bit CPU).

Earlier, whenever I run this command

              $ make drivers/staging/rdma/
I was getting this error

CONFIG_X86_X32 enabled but no binutils support
So, I thought to cross compile for x82. But now it seems i have solved by
following this
<http://stackoverflow.com/questions/12501124/errors-in-compiling-linux-kernel-module-config-x86-x32-enabled-but-no-binutils>

On Tue, Jun 7, 2016 at 3:16 AM, <Valdis.Kletnieks@vt.edu> wrote:

> On Tue, 07 Jun 2016 02:27:03 +0530, Shyam Saini said:
>
> > To choose best optimized code, i need to first compile them and then
> > disassemble  the compiled code, where a change in single line would make
> a
> > significant difference in the performance.
>
> Note that due to things like cache line misses, looking at the code will
> tell you almost nothing about which is *really* the "best" code...
>
> > So, my question is how to compile* x86 based network drivers  on x86_64
> > Ubuntu machine*. Currently I'm running Ubuntu 14.04.
>
> Why do you need to cross-compile?  Just build the drivers as x86_64.
> Pretty
> much anybody who actually *cares* about performance has moved off 32-bit
> kernels a while ago (unless you're stuck with an embedded 32-bit CPU).
>
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RE: Cross Compilation

[Jim Thompson]

One more time, the current top-of-tree on 'buildroot' is broken.

Specifically, the 'chew' binary gets built for the target, but should be
built for the host.  The build fails when 'chew' gets run (because it
can't).

Erik is looking for a patch.

Jim


> -----Original Message-----
> From: Jeff Baitis [mailto:baitisj@evolution.com]
> Sent: Wednesday, July 23, 2003 11:27 AM
> To: Jun Sun
> Cc: Tiemo Krueger - mycable GmbH; saravana_kumar@naturesoft.net;
linux-
> mips@linux-mips.org
> Subject: Re: Cross Compilation
> 
> I find that the uClibC tools are excellent, and have no problems
> generating
> MIPS binaries from an i386 host ;)
> 
> -Jeff
> 
> On Wed, Jul 23, 2003 at 10:09:46AM -0700, Jun Sun wrote:
> > On Wed, Jul 23, 2003 at 09:45:43AM +0200, Tiemo Krueger - mycable
GmbH
> wrote:
> > > You could even use the buildroot thing from uclibc.org:
> > >
> > >
http://uclibc.org/cgi-bin/cvsweb/buildroot/buildroot.tar.gz?tarball=1
> > >
> > > It's one of the most simple way for cross toolchain beginners, it
> > > provides you finally with a toolchain and rootfile system and more
> > >
> >
> > I took a look.  It looks similar to one project that I worked on
> > before.   Very interesting.
> >
> > Has anybody tried successfully to do a cross MIPS yet?  From a
> Linux/i386 host
> > obviously ...
> >
> > Jun
> >
> 
> --
>          Jeffrey Baitis - Associate Software Engineer
> 
>                     Evolution Robotics, Inc.
>                      130 West Union Street
>                        Pasadena CA 91103
> 
>  tel: 626.535.2776  |  fax: 626.535.2777  |  baitisj@evolution.com
> 

RE: Cross Compilation

[Jim Thompson]

One more time, the current top-of-tree on 'buildroot' is broken.

Specifically, the 'chew' binary gets built for the target, but should be
built for the host.  The build fails when 'chew' gets run (because it
can't).

Erik is looking for a patch.

Jim


> -----Original Message-----
> From: Jeff Baitis [mailto:baitisj@evolution.com]
> Sent: Wednesday, July 23, 2003 11:27 AM
> To: Jun Sun
> Cc: Tiemo Krueger - mycable GmbH; saravana_kumar@naturesoft.net;
linux-
> mips@linux-mips.org
> Subject: Re: Cross Compilation
> 
> I find that the uClibC tools are excellent, and have no problems
> generating
> MIPS binaries from an i386 host ;)
> 
> -Jeff
> 
> On Wed, Jul 23, 2003 at 10:09:46AM -0700, Jun Sun wrote:
> > On Wed, Jul 23, 2003 at 09:45:43AM +0200, Tiemo Krueger - mycable
GmbH
> wrote:
> > > You could even use the buildroot thing from uclibc.org:
> > >
> > >
http://uclibc.org/cgi-bin/cvsweb/buildroot/buildroot.tar.gz?tarball=1
> > >
> > > It's one of the most simple way for cross toolchain beginners, it
> > > provides you finally with a toolchain and rootfile system and more
> > >
> >
> > I took a look.  It looks similar to one project that I worked on
> > before.   Very interesting.
> >
> > Has anybody tried successfully to do a cross MIPS yet?  From a
> Linux/i386 host
> > obviously ...
> >
> > Jun
> >
> 
> --
>          Jeffrey Baitis - Associate Software Engineer
> 
>                     Evolution Robotics, Inc.
>                      130 West Union Street
>                        Pasadena CA 91103
> 
>  tel: 626.535.2776  |  fax: 626.535.2777  |  baitisj@evolution.com
> 

RE: Cross Compilation

[Jim Thompson]

Unfortunately, its broken right now.

> -----Original Message-----
> From: Tiemo Krueger - mycable GmbH [mailto:tk@mycable.de]
> Sent: Wednesday, July 23, 2003 12:46 AM
> To: saravana_kumar@naturesoft.net
> Cc: linux-mips@linux-mips.org
> Subject: Re: Cross Compilation
> 
> You could even use the buildroot thing from uclibc.org:
> 
> http://uclibc.org/cgi-bin/cvsweb/buildroot/buildroot.tar.gz?tarball=1
> 
> It's one of the most simple way for cross toolchain beginners, it
> provides you finally with a toolchain and rootfile system and more
> 
> Tiemo
> 
> SaravanaKumar wrote:
> 
> >Dear All,
> >    I am having my application in x86.
> > I have to cross compile that to MIPS architecture.
> >How to do that.
> >
> >Is there is any document for doing the cross compilation to MIPS.
> >
> >Cheers,
> >N.S.Kumar
> >
> >
> >
> >
> >
> 
> 

RE: Cross Compilation

[Jim Thompson]

Unfortunately, its broken right now.

> -----Original Message-----
> From: Tiemo Krueger - mycable GmbH [mailto:tk@mycable.de]
> Sent: Wednesday, July 23, 2003 12:46 AM
> To: saravana_kumar@naturesoft.net
> Cc: linux-mips@linux-mips.org
> Subject: Re: Cross Compilation
> 
> You could even use the buildroot thing from uclibc.org:
> 
> http://uclibc.org/cgi-bin/cvsweb/buildroot/buildroot.tar.gz?tarball=1
> 
> It's one of the most simple way for cross toolchain beginners, it
> provides you finally with a toolchain and rootfile system and more
> 
> Tiemo
> 
> SaravanaKumar wrote:
> 
> >Dear All,
> >    I am having my application in x86.
> > I have to cross compile that to MIPS architecture.
> >How to do that.
> >
> >Is there is any document for doing the cross compilation to MIPS.
> >
> >Cheers,
> >N.S.Kumar
> >
> >
> >
> >
> >
> 
> 

RE: Cross Compilation

[eric_sy_huang]

  If I want to build big-endian mips, how can I do?
  In the www.linux-vr.org, there is only little-endian tools.

  regards.




This document is classified as     Normal



try http://www.linux-vr.org/tools.html

-Jinu

-----Original Message-----
From: SaravanaKumar [mailto:saravana_kumar@naturesoft.net]
Sent: Wednesday, July 23, 2003 11:50 AM
To: linux-mips@linux-mips.org
Subject: Cross Compilation


Dear All,
    I am having my application in x86.
 I have to cross compile that to MIPS architecture.
How to do that.

Is there is any document for doing the cross compilation to MIPS.

Cheers,
N.S.Kumar

RE: Cross Compilation

[JinuM]

try http://www.linux-vr.org/tools.html

-Jinu

-----Original Message-----
From: SaravanaKumar [mailto:saravana_kumar@naturesoft.net]
Sent: Wednesday, July 23, 2003 11:50 AM
To: linux-mips@linux-mips.org
Subject: Cross Compilation


Dear All, 
    I am having my application in x86. 
 I have to cross compile that to MIPS architecture. 
How to do that. 

Is there is any document for doing the cross compilation to MIPS.

Cheers, 
N.S.Kumar

Cross Compilation

[SaravanaKumar]

Dear All, 
    I am having my application in x86. 
 I have to cross compile that to MIPS architecture. 
How to do that. 

Is there is any document for doing the cross compilation to MIPS.

Cheers, 
N.S.Kumar

Re: Cross Compilation

[debashis]

Hi,
see the url - http://www.linux-mips.org/toolchain.html
You need to install the appropiate toolchains.

Regards,
debashis

SaravanaKumar wrote:

> Dear All,
>     I am having my application in x86.
>  I have to cross compile that to MIPS architecture.
> How to do that.
>
> Is there is any document for doing the cross compilation to MIPS.
>
> Cheers,
> N.S.Kumar

Re: Cross Compilation

[Tiemo Krueger - mycable GmbH]

You could even use the buildroot thing from uclibc.org:

http://uclibc.org/cgi-bin/cvsweb/buildroot/buildroot.tar.gz?tarball=1

It's one of the most simple way for cross toolchain beginners, it
provides you finally with a toolchain and rootfile system and more

Tiemo

SaravanaKumar wrote:

>Dear All, 
>    I am having my application in x86. 
> I have to cross compile that to MIPS architecture. 
>How to do that. 
>
>Is there is any document for doing the cross compilation to MIPS.
>
>Cheers, 
>N.S.Kumar
>
>
>
>  
>

Re: Cross Compilation

[Jun Sun]

On Wed, Jul 23, 2003 at 09:45:43AM +0200, Tiemo Krueger - mycable GmbH wrote:
> You could even use the buildroot thing from uclibc.org:
> 
> http://uclibc.org/cgi-bin/cvsweb/buildroot/buildroot.tar.gz?tarball=1
> 
> It's one of the most simple way for cross toolchain beginners, it
> provides you finally with a toolchain and rootfile system and more
>

I took a look.  It looks similar to one project that I worked on
before.   Very interesting.

Has anybody tried successfully to do a cross MIPS yet?  From a Linux/i386 host
obviously ...

Jun

Re: Cross Compilation

[Bruno Randolf]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Wednesday 23 July 2003 19:09, you wrote:

> Has anybody tried successfully to do a cross MIPS yet?  From a Linux/i386
> host obviously ...

yes, i have done that (last time around may 2003) and it worked great.

now it switched to a glibc based system, so i cant use it anymore 
unfortunately.

bruno
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Re: Cross Compilation

[Jeff Baitis]

I find that the uClibC tools are excellent, and have no problems generating
MIPS binaries from an i386 host ;)

-Jeff

On Wed, Jul 23, 2003 at 10:09:46AM -0700, Jun Sun wrote:
> On Wed, Jul 23, 2003 at 09:45:43AM +0200, Tiemo Krueger - mycable GmbH wrote:
> > You could even use the buildroot thing from uclibc.org:
> > 
> > http://uclibc.org/cgi-bin/cvsweb/buildroot/buildroot.tar.gz?tarball=1
> > 
> > It's one of the most simple way for cross toolchain beginners, it
> > provides you finally with a toolchain and rootfile system and more
> >
> 
> I took a look.  It looks similar to one project that I worked on
> before.   Very interesting.
> 
> Has anybody tried successfully to do a cross MIPS yet?  From a Linux/i386 host
> obviously ...
> 
> Jun
> 

-- 
         Jeffrey Baitis - Associate Software Engineer

                    Evolution Robotics, Inc.
                     130 West Union Street
                       Pasadena CA 91103

 tel: 626.535.2776  |  fax: 626.535.2777  |  baitisj@evolution.com 

RE: Cross Compilation

[Lyle Bainbridge]

> I took a look.  It looks similar to one project that I worked on
> before.   Very interesting.
> 
> Has anybody tried successfully to do a cross MIPS yet?  From 
> a Linux/i386 host obviously ...

I have used the uclibc toolchain for big endian mips. It works great.  I
also have a gcc-3.2.3/glibc-2.2.5 based toolchain, and have used it to
cross compile a kernel and a simple root filesystem.

Lyle

RE: Cross Compilation

[Lyle Bainbridge]

> I took a look.  It looks similar to one project that I worked on
> before.   Very interesting.
> 
> Has anybody tried successfully to do a cross MIPS yet?  From 
> a Linux/i386 host obviously ...

I have used the uclibc toolchain for big endian mips. It works great.  I
also have a gcc-3.2.3/glibc-2.2.5 based toolchain, and have used it to
cross compile a kernel and a simple root filesystem.

Lyle