linux-kernel - Re: [PATCH v2 09/13] can: pruss CAN driver.

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Message-ID: <CAA7B3D71228413B9F7F3C0F5A011119@subhasishg>
Date:	Fri, 18 Feb 2011 14:39:15 +0530
From:	"Subhasish Ghosh" <subhasish@...tralsolutions.com>
To:	"Marc Kleine-Budde" <mkl@...gutronix.de>
Cc:	"Wolfgang Grandegger" <wg@...ndegger.com>,
	<sachi@...tralsolutions.com>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"CAN NETWORK DRIVERS" <netdev@...r.kernel.org>, <nsekhar@...com>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"CAN NETWORK DRIVERS" <socketcan-core@...ts.berlios.de>,
	<m-watkins@...com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 09/13] can: pruss CAN driver.

Ok, will do NAPI


On 02/18/2011 09:15 AM, Subhasish Ghosh wrote:
>> On 02/18/2011 08:07 AM, Subhasish Ghosh wrote:
>>> --------------------------------------------------
>>> From: "Kurt Van Dijck" <kurt.van.dijck@....be>
>>
>> ...
>>>>> + /* register interrupt handler */
>>>>> + err = request_irq(priv->trx_irq, &omapl_rx_can_intr, IRQF_SHARED,
>>>>> +   "pru_can_irq", ndev);
>>>> you're doing a lot of work _in_ the irq handler. Maybe threaded irq?
>>>>
>>> SG -Ok, will do
>>
>> No, please use NAPI instead.
> 
> We are using h/w filters, so the number of interrupts coming into the
> processor are not hogging it.
> I feel that we may not require an interrupt mitigation.

As davem stated the other day, all new drivers should use NAPI.

regards, Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 | 
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