Re: More 2.4.4 benchmarks

From: jmjonesat_private
Date: Wed May 09 2001 - 11:14:38 PDT

  • Next message: Crispin Cowan: "Re: More 2.4.4 benchmarks"

    On Wed, 9 May 2001, Crispin Cowan wrote:
    
    > Valdis.Kletnieksat_private wrote:
    > 
    > > On Wed, 09 May 2001 00:33:49 PDT, Crispin Cowan said:
    > > > For the most part, they show very little degradation due to LSM.  Good.
    > >
    > > > The curious metric is main memory latency:  it shows considerable degradation,
    > > > when this is one metric I would expect to be unaffected by LSM.  I don't have a
    > > > decent conjecture of what would cause this.
    > >
    > > OK.. Speculating on the *weird* causes first. ;)
    > 
    > Yup, cache pathologies are a likely candidate to cause this.
    > 
    > 
    > > Time to go can-opener the lmbench code and start looking, I guess....
    > 
    > Or just ignore it for now, and see if the artifact goes away or reverses itself.
    > Chasing cache artifacts can be a very expensive hobby :-)
    
    Just ignoring it will not *necessarily* make it go away, but it may be
    a temporary manifestation.  Let's hope the coders don't "ignore it" but 
    keep it in mind with future patches/code.
    
    > 
    > Crispin
    > 
    > --
    > Crispin Cowan, Ph.D.
    > Chief Scientist, WireX Communications, Inc. http://wirex.com
    
    J. Melvin Jones
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