[ofa-general] Re: [PATCH 1/4] [NET_SCHED] explict hold dev tx lock

[David Miller]

From: jamal <hadi at cyberus.ca>
Date: Mon, 08 Oct 2007 09:34:50 -0400

> The brain-block i am having is the parallelization aspect of it.
> Whatever scheme it is - it needs to ensure the scheduler works as
> expected. For example, if it was a strict prio scheduler i would expect
> that whatever goes out is always high priority first and never ever
> allow a low prio packet out at any time theres something high prio
> needing to go out. If i have the two priorities running on two cpus,
> then i cant guarantee that effect.
> IOW, i see the scheduler/qdisc level as not being split across parallel
> cpus. Do i make any sense?

Picture it like N tubes you stick packets into, and the tubes are
processed using DRR.

So packets within a tube won't be reordered, but reordering amongst
tubes is definitely possible.