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

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Date:	Fri, 07 Nov 2008 09:29:56 -0500
From:	"Alan D. Brunelle" <Alan.Brunelle@...com>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][v3] blktrace: conversion to tracepoints


> 
> 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.]

Regards,
Alan


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