Patch for 1mpps on if_em (was: FreeBSD handles leapsecondcorrectly)

Daniel Gerzo danger at
Sun Jan 8 05:33:40 PST 2006

On Sun, Jan 08, 2006 at 12:33:47PM +0100, Andre Oppermann wrote:
> Massimo Lusetti wrote:
> > 
> > On Sat, 2006-01-07 at 13:24 -0700, Scott Long wrote:
> > 
> > > I'm about to release a patch to Andre that should allow if_em to fast
> > > forward 1mpps or more on his hardware, using no shortcuts or hacks other
> > > than the inherent shortcut that the ffwd code provides.  The approach
> > > I'm taking also works on the other high performance network interfaces.
> > > There is also a lot of work going on to streamline the ifnet layer that
> > > will likely result in several hundred nanoseconds of latency being
> > > removed from there.  I'd personally love to see DragonFly approach this
> > 
> > Will all this great stuff end up in RELENG_6 branch?
> Some of it but not all.  Those things which are driver optimizations and
> other detail stuff will be backported.  Stuff that does architectual and
> API/ABI changes will not.  We are not allowed to break the API/ABI within
> a -STABLE series.

are these things related to your TCP/IP Cleanup and Optimizations work?
if so, does it mean that you are going to merge this work to current

> > That's very good news (TM) to hear...
> Indeed.  I have tons of measurements and data from the test runs which has
> to be processed.  Once that is done we can start to reach firm conclusions
> and to tackle all the other items which put some breaks on the performance.
> -- 
> Andre


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