Interesting analysis of linux kernel threading by IBM

Mar Ene 25 01:23:52 CST 2000


Hi,

> As has been stated convincingly here (for me, at least) very high
> load means a runqueue of at the very most 10, ridiculous overload
> gives some 30. So your scheduler (using your own measurements!)
> hurts performance except for ridiculous overload (and contrieved
> benchmarks).

     I couldn't agree more.  I worked on two large AIX boxen this
year (8- and 12-way S7As with gigs of RAM) which were getting buried
under runqueues that ran past 2000 (no typo).  The problem was not
in our software or in the kernel--it was simply very poor system
software design done by others in years past.  There is nothing that
anyone can or should do to meet such loads; instead, one should look
at fixing the broken software design causing them.


     Cheers,

     Justin Fries
     justinf en us.ibm.com
     Raleigh, North Carolina


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