netdev - Re: [net-next 11/13] igb: Make Tx budget for NAPI user adjustable

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Date:	Wed, 28 Sep 2011 00:45:46 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Andy Gospodarek <andy@...yhouse.net>,
	Stephen Hemminger <stephen.hemminger@...tta.com>,
	jeffrey t kirsher <jeffrey.t.kirsher@...el.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	gospo@...hat.com, Alexander H Duyck <alexander.h.duyck@...el.com>
Subject: Re: [net-next 11/13] igb: Make Tx budget for NAPI user adjustable

On Tue, 2011-09-20 at 16:23 -0400, Neil Horman wrote:
[...]
> This is the work Andy is referring to for those interested:
> http://marc.info/?l=linux-kernel&m=131644727521409&w=2
> 
> This version has Gregs Ack, and is waiting for an Ack from Jesse Barnes at the
> moment.

While I think it's useful to be able to list all IRQs assigned to a PCI
device, this doesn't tell us anything about the way they're associated
with queues.

> I think Andy's probably right, theres room here for expansion to create
> a relationship between a given interrupt and a napi wieght.  I expect what would
> be most direct would be adding a napi_weight attribute that was conditional on
> the class of the pci device allocating the irqs (make it visible for class 0x200
> devs, invisible for others).

That's a terrible idea; what has NAPI got to do with PCI devices?

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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