On Fri, Mar 22, 2002 at 06:34:00PM -0800, David Wolfskill wrote:
> >Date: Fri, 22 Mar 2002 20:43:03 -0500 (EST)
> >From: Jeff Roberson <[EMAIL PROTECTED]>
> >Are you both running with WITNESS and INVARIANTS?  UMA is slightly slower
> >with these options on than the original malloc & vm_zone code.  I'm not
> >sure why it would be even worse for SMP machines though.  So maybe it
> >isn't UMA at all but it's worth looking into.
> I don't speak (or write) for John, but yes, I have both WITNESS &
> INVARIANTS in my -CURRENT kernels.  (The link I posted refers to a page
> that has copies of each kernel config, among other bits of trivia.)

As more locks are added to the kernel the overhead of WITNESS becomes
greater.  21 March was around the time of Jeff's UMA commit.


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