Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q7

Lee Revell
2004-09-01T20:27:37Z

On Wed, 2004-09-01 at 16:11, Peter Zijlstra wrote:
> On Wed, 2004-09-01 at 19:09 +0200, Thomas Charbonnel wrote:
> > Ingo Molnar wrote :
> > > i've released the -Q7 patch:
> > >
> > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc1-bk4-Q7
> >
> > With Q7 I still get rx latency issues (> 130 us non-preemptible section
> > from rtl8139_poll). Moreover network connections were extremely slow
> > (almost hung) until I set /proc/sys/net/core/netdev_backlog_granularity
> > to 2.
> >
> > Thomas
> >
>
> Me too!
> I too have a rtl8139 network card.
>
> kr, what kind of nic do you have since this does not occur on your
> machine?

Hmm, I am not a network driver expert, and this is just a guess, but if
they work anything like sound cards, I would say that that that hardware
will only generate an interrupt when there are 2 packets in its queue.

Lee