[ofa-general] Re: [PATCH 2/3][NET_BATCH] net core use batching
Jeff Garzik
jeff at garzik.org
Tue Oct 9 12:04:23 PDT 2007
Waskiewicz Jr, Peter P wrote:
>> IMO the net driver really should provide a hint as to what it wants.
>>
>> 8139cp and tg3 would probably prefer multiple TX queue
>> behavior to match silicon behavior -- strict prio.
>
> If I understand what you just said, I disagree. If your hardware is
> running strict prio, you don't want to enforce strict prio in the qdisc
> layer; performing two layers of QoS is excessive, and may lead to
> results you don't want. The reason I added the DRR qdisc is for the Si
> that has its own queueing strategy that is not RR. For Si that
> implements RR (like e1000), you can either use the DRR qdisc, or if you
> want to prioritize your flows, use PRIO.
A misunderstanding, I think.
To my brain, DaveM's item #2 seemed to assume/require the NIC hardware
to balance fairly across hw TX rings, which seemed to preclude the
8139cp/tg3 style of strict-prio hardware. That's what I was responding to.
As long as there is some modular way to fit 8139cp/tg3 style multi-TX
into our universe, I'm happy :)
Jeff
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