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Date: Tue, 09 Nov 2004 10:18:19 -0800
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Subject: Re: cvs commit: src/sys/i386/i386 pmap.c
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Is this with HTT?

We've dicoverred that HTT makes better code run slower, remember?


Robert Watson wrote:

>On Tue, 9 Nov 2004, Robert Watson wrote:
>
>  
>
>>>I've tried changing the store_rel() to just do a simple store since writes are 
>>>ordered on x86, but benchmarks on SMP showed that it actually hurt.  However, 
>>>it would probably be good to at least do that for UP.  The current patch to 
>>>do it for all kernels is:
>>>      
>>>
>
>Interestingly, I've now run through some more "macro" benchmarks.  I saw a
>couple of percent improvement on UP from the change, but indeed, I saw a
>slight decrease in performance for the rapid packet send benchmark on SMP. 
>
>So I guess my recommendation is to get this in the tree for UP, and see if
>we can figure out why it's having the slow-down effect on SMP.
>
>Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
>robert@fledge.watson.org      Principal Research Scientist, McAfee Research
>  
>