Date: Mon, 25 Oct 2010 09:55:48 -0700 From: David Wolfskill <david@catwhisker.org> To: Julian Elischer <julian@freebsd.org> Cc: freebsd-performance@freebsd.org Subject: Re: Possible evidence of performance regression for 8.1-S (vs. 7.1) Message-ID: <20101025165548.GE1519@albert.catwhisker.org> In-Reply-To: <4CBF8032.8000609@freebsd.org> References: <20101020174854.GZ21226@albert.catwhisker.org> <4CBF8032.8000609@freebsd.org>
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On Wed, Oct 20, 2010 at 04:50:10PM -0700, Julian Elischer wrote:
> ...
> try the 7.x machine but running the 8.x kernel.. i.e. change nothing,=20
> but boot the new kernel.
> ...
OK; here are results of previous tests, along with the above. As noted
earlier, I needed to set the UNAME_r environmant variable in order for
the build to succeed with the 7.x userland & 8.x kernel:
start stop real user sys host os
1287436357 1287461948 25590.99 81502.22 18115.07 ref-8x 8.1-S
1287462797 1287488766 25969.26 81452.14 17920.14 ref-8x 8.1-S
1287489641 1287515287 25645.84 81548.40 18256.52 ref-8x 8.1-S
1287516151 1287541481 25329.64 81546.23 18294.10 ref-8x 8.1-S
1287542355 1287568599 26244.59 81431.47 17902.39 ref-8x 8.1-S
1287525363 1287546846 21483.13 82628.20 21703.09 ref-7x 7.1-R+
1287548005 1287569100 21094.63 82853.19 22185.02 ref-7x 7.1-R+
1287570300 1287591371 21071.33 82756.81 21943.22 ref-7x 7.1-R+
1287592592 1287614103 21511.23 82637.30 21849.90 ref-7x 7.1-R+
1287615323 1287636770 21446.42 82715.81 21708.97 ref-7x 7.1-R+
1287710312 1287732046 21733.20 82688.01 22108.95 ref-8x 7.1-R+
1287733360 1287754549 21188.88 82869.09 21890.83 ref-8x 7.1-R+
1287755881 1287777566 21684.09 82772.50 21933.74 ref-8x 7.1-R+
1287879508 1287905173 25665.03 81696.22 18278.42 ref-8x 8.1-S[7.1-R+ =
user]
1287906039 1287931709 25669.48 81735.00 18265.78 ref-8x 8.1-S[7.1-R+ =
user]
1287932573 1287958275 25700.99 81700.40 18246.04 ref-8x 8.1-S[7.1-R+ =
user]
1287959144 1287984859 25714.74 81800.40 18346.57 ref-8x 8.1-S[7.1-R+ =
user]
1287985748 1288011752 26004.33 81569.28 17967.68 ref-8x 8.1-S[7.1-R+ =
user]
The stanzas depict resource usage during each iteration of the workload
under test (building software) under various conditions:
* First, building on the ref-8x machine, running FreeBSD 8.1-STABLE r214029.
* For comparison, building on the ref-7.x machine, running a lightly-
patched 7.1-R.
* As a reality check, building on the ref-8.x machine, running the
above-cited 7.1-R (+patches) -- just to verify that there wasn't
something obviously different in the hardware configurations or
connections.
* Finally, the requested 8.1-S kernel with 7.1-R+ userland (though I ran
it on the ref-8x machine, as I had some other things to do with the
ref-7.x machine).
It appears to me that the last test runs show results that are just
about identical to the "native" 8.1-S kernel+userland, so if I
understand the logic correctly, that appears to implicate something in
the 8.1-S kernel (or the default configuration for same).
Peace,
david
--=20
David H. Wolfskill david@catwhisker.org
Depriving a girl or boy of an opportunity for education is evil.
See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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