Re: [PATCH RFC V6 0/11] Paravirtualized ticketlocks

From: Ingo Molnar
Date: Sat Mar 31 2012 - 04:12:04 EST

* Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:

> > Care to back that up with numbers and proper trace evidence
> > instead of handwaving?
> E.g. my plumbers presentations on lock and mm scalability from
> last year has some graphs that show this very clearly, plus
> some additional data on the mutexes. This compares to the
> glibc futex locks, which perform much better than the kernel
> mutex locks on larger systems under higher contention

If you mean these draft slides:

it has very little verifiable information in it. It just
cryptically says lock hold time "microbenchmark", which might or
might not be a valid measurement.

You could have been honest and straightforward in your first

"I ran workload X on machine Y, and got results Z."

Instead you are *hindering* the discussion:

> Given your tone I will not supply an URL. [...]

If you meant the above URL then it's not the proper numbers
Thomas asked for, just some vague slides. If you meant something
else then put up or shut up.


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