PERFORCE change 111230 for review

[Paolo Pisati]

On Thu, Dec 07, 2006 at 01:20:26PM +0100, Andre Oppermann wrote:
> Gleb Smirnoff wrote:
> >On Wed, Dec 06, 2006 at 11:19:42PM +0000, Paolo Pisati wrote:
> >P> http://perforce.freebsd.org/chv.cgi?CH=111230
> >P> 
> >P> Change 111230 by piso at piso_newluxor on 2006/12/06 23:19:06
> >P> 
> >P> 	To workaround a problem when an mbuf is bigger than MCLBYTES
> >P> 	(and thus not handled by m_megapullup()), introduce & use
> >P> 	m_jumbo16pullup() that uses 16k jumbo size cluster.
> >P> 	
> >P> 	This problem only showed up on traffic generated on a box with 
> >P> 	a nic tso enabled.
> >
> >Paolo,
> >
> >this isn't a fix. Another application will do write(,, 16k + 1) and
> >m_jumbo16pullup() will fail again. Please backout it, it is a hack.
> >
> >We need to fix TSO in such way that real packets, that will be
> >transmitted to wire, will be passed to pfil handlers.
> 
> That is not possible.

Then, after a discussion on irc, pull the plug on any
present (and future) hackery & half-baked solution, and declare
in kernel libalias incompatible with tso.

bye
-- 

Paolo

Piso's first law: nothing works as expected!