Re: FreeBSD 3.1 SMP outperforms SuSE 6.0 SMP by factor 2.3 !!!

From: Greg Lehey <grog(at)>
Date: Mon, 15 Mar 1999 17:13:20 +1030

On Sunday, 14 March 1999 at 19:05:42 -0800, unknown(at) wrote:
> On Sun, 14 Mar 1999, Gregory Sutter wrote:
>> On Mon, Mar 15, 1999 at 12:15:21AM +0100, Andreas Klemm wrote:
>>> See the links in my signature ...
>>> Enjoy it ... Linux brings 0% performance gain in the "stable" system
>>> SMP arena ......
>>> See :
>>> http://www.FreeBSD.ORG/~fsmp/SMP/akgraph-a/graph1.html
>> Well, if you wanted this to be really public, you picked the right way
>> to go about it. Just wait until someone drops this onto the linux
>> lists. I wonder what the signal:flame ratio will be. Bets, anyone, on
>> time to slashdot, as well as the ratio?
> I don't have a problem with FreeBSD doing any better than Linux in SMP.
> I'm going to use whatever OS gives me the best performance, and I'll
> switch to FreeBSD for the majority of my servers in a second if it'll help
> me. I'm fairly competent with both OS, even if I do have more experience
> with Linux. I do however object to the testing methods here -- For one
> thing, it doesn't look like the Linux kernel was actually recompiled in
> SMP mode, 'coz I can build bash in that time in single processor mode :) I
> definitely see massive improvements when I use a dual+ processor system
> under Linux. SuSE, to the best of my knowledge, doesn't ship SMP kernels
> in the default distribution. And of course, SuSE' STABLE kernel doesn't
> mean much, since the distributions aren't tied to the kernel tree like
> FreeBSD is. The 2.2.x series kernels are available, with upgrade
> instructions on if anyone feels like rerunning
> those tests.

I tend to agree. I could accept the statement "Linux SMP gives less
performance than FreeBSD SMP". I can't accept the statement "Linux
SMP gives no performance improvement". The first thing that came into
my mind was "he must have made a mistake". Other possibilities are
that make -j doesn't work right on Linux, or that Linux SMP doesn't
even the load as well as FreeBSD does (for example, some MP systems
put all children in the same CPU).


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Received on Mon 15 Mar 1999 - 07:43:44 CET

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