Re: forwarding/ipfw/pf evolution (in pps) on -current

From: Adrian Chadd <adrian_at_freebsd.org>
Date: Thu, 25 Apr 2013 11:30:34 -0700
On 25 April 2013 02:28, Andre Oppermann <andre_at_freebsd.org> wrote:

> Again one has to be really careful drawing any firm conclusions from this
> as it was measured on a Pentium4 and UP kernel (GENERIC would add WITNESS
> and INVARIANT overhead as well).
>
> The Pentium4 is about the worst micro-architecture when it comes to locks
> and easily regresses.  At the same time modern Intel Core i[3-7] and AMD64
> may actually improve with these changes.  Unless more recent micro-archs
> have been shown to exhibit the same regression we can't claim this change
> was bad (other than for Pentium4).

Sure, but he's done the heavy lifting.

It'll be interesting to compare these results on a variety of
platforms, not just the modern desktop/server style CPUs.

Eg, if someone has the time, spinning this stuff up on the multi-core
MIPS stuff in the netperf cluster (that's supposed to be a network
forwarding engine) would be nice.

And to be honest - having a set of performance checks for the same SVN
revision but different physical machines is a good comparison point.
It may be that we can start classifying different kinds of platform
silliness from this which could lead to some better coding guidelines.


Adrian
Received on Thu Apr 25 2013 - 16:30:36 UTC

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