linux-kernel - Re: [PATCH][v3] blktrace: conversion to tracepoints

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Date:	Fri, 7 Nov 2008 13:38:14 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	"Alan D. Brunelle" <Alan.Brunelle@...com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][v3] blktrace: conversion to tracepoints

Em Fri, Nov 07, 2008 at 03:32:16PM +0100, Jens Axboe escreveu:
> On Fri, Nov 07 2008, Alan D. Brunelle wrote:
> > 
> > > 
> > > I'll apply this for 2.6.29. I'm assuming you have tested this as well?
> > > 
> > 
> > FYI: I tested this on a 16-way AMD x86_64 box (128GB RAM, a couple of
> > Smart Array (CCISS) P800's). Running Jens' for-2.6.29 git tree versus a
> > recent Linus 2.6.28-rc3 tree. I was doing kernel makes (10 passes for
> > both kernels), and found that things worked just fine. All values below
> > are in seconds:
> > 
> > 2.6.28-rc3:
> > 
> >     Part     Min     Avg     Max     Dev
> > -------- ------- ------- ------- -------
> >    untar  17.996  22.565  23.522   1.690
> >   mk-cfg   3.279   3.454   3.529   0.070
> >  mk-kern 140.837 141.557 142.549   0.626
> > mk-clean  10.460  11.604  12.710   0.758
> > -------- ------- ------- ------- -------
> >    Combd 172.941 179.180 181.600   2.470
> > ======== ======= ======= ======= =======
> >    %sys   7.67%   7.78%   8.03%   0.114
> > 
> > 
> > Jens' origin/for-2.6.29:
> > 
> >     Part     Min     Avg     Max     Dev
> > -------- ------- ------- ------- -------
> >    untar  18.138  22.576  24.279   1.693
> >   mk-cfg   3.270   3.483   3.751   0.118
> >  mk-kern 141.290 142.115 142.666   0.439
> > mk-clean   8.263   9.609  10.211   0.624
> > -------- ------- ------- ------- -------
> >    Combd 173.736 177.783 179.654   1.786
> > ======== ======= ======= ======= =======
> >    %sys   7.77%   7.85%   8.01%   0.074
> > 
> > 
> > Not sure why the 'make clean' portion of the runs went noticeably better
> > with the newer code, but in any event, I don't see much difference
> > elsewhere, and for sure the blktrace portion of things worked correctly.
> > [blktrace + blkparse + blkrawverify + btt all worked just fine out of
> > the box.]
> 
> Thanks a lot for running that test Alan, I think it looks fine!

Indeed, thanks a lot!

- Arnaldo
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