netdev - Re: [PATCH net-next 0/2] sunvnet: Packet processing in non-interrupt context.

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Date:	Wed, 1 Oct 2014 16:23:15 -0400
From:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:	David Miller <davem@...emloft.net>
Cc:	raghuram.kothakota@...cle.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/2] sunvnet: Packet processing in non-interrupt
 context.

On (10/01/14 16:15), David Miller wrote:
> > 
> > If I make this a NAPI driver that uses napi_gro_receive, I would
> > still have to deal with a budget, right?
> 
> Absolutely, and YOU MUST, because the budget keeps one device from
> hogging the RX packet input path from other devices on a given cpu.

yes, but limiting the budget of sk_buffs read mid-way during descriptor
read is deadly to perf because of the ensuing LDC stop/start exchange -
ends up being even worse than the baseline.

Doesnt the netif_rx/process_backlog infra already do a napi_schedule,
thus avoiding the above concern? 

--Sowmini

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