Re: 4.7 vs 5.2.1 SMP/UP bridging performance

From: Scott Long <scottl_at_freebsd.org>
Date: Tue, 04 May 2004 14:14:20 -0600
Kris Kennaway wrote:

> On Tue, May 04, 2004 at 03:55:32PM -0400, Gerrit Nagelhout wrote:
> 
> 
>>I would like to move to CURRENT for new hardware support, and the 
>>ability to properly use multi-threading in user-space, but can't do
>>this until the performance bottlenecks are solved.  I realize that 
>>5.x is still a work in progress and hasn't been tuned as well as 4.7 
>>yet, but are there any plans for optimizations in this area?  Does 
>>anyone have any suggestions on what else I can try?
> 
> 
> Try rwatson's netperf patches:
> 
>   http://www.watson.org/~robert/freebsd/netperf/
> 
> There is at least one outstanding panic condition known, but more
> testing will be a great help.
> 
> Kris
> 
> P.S. You didn't mention the status of WITNESS, but I'm assuming you
> read the docs and disabled it since it's a huge performance killer.

WITNESS and INVARIANTS are turned off for the 5.2.1 release bits.
However, the debug.mpsafenet sysctl is also turned off.  Turning this
on might give a significant performance boost for bridging.

Scott
Received on Tue May 04 2004 - 11:15:16 UTC

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