From: Arnd Bergmann <arnd@arndb.de>
To: krishna <krishna.c@globaledgesoft.com>
Cc: drizzd@aon.at, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Documentation on top half and bottom halves
Date: Sat, 18 Dec 2004 15:08:53 +0100 [thread overview]
Message-ID: <200412181508.57980.arnd@arndb.de> (raw)
In-Reply-To: <41C4339C.7020005@globaledgesoft.com>
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On Sünnavend 18 Dezember 2004 14:41, you wrote:
> How to understand when to use which mechanism depending upon the hardware:
>
> 1) If DMA support is not there and If it is there.
> 2) If Shared Interrupts are there and not there.
> 3) If there are multiple same Host controllers and single Host Controller.
It's independent of these questions. The decision between tasklet and
workqueue is mostly:
- If you need non-atomic operations (e.g. allocate memory with GFP_KERNEL),
you have to use work queues.
- If you need very low latencies for processing the interrupts, you should
use tasklets.
- When in doubt, use work queues.
Arnd <><
PS: pleas read http://www.netmeister.org/news/learn2quote.html
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prev parent reply other threads:[~2004-12-18 14:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-18 9:34 Documentation on top half and bottom halves krishna
2004-12-18 10:56 ` Clemens Buchacher
2004-12-18 12:21 ` krishna
2004-12-18 13:41 ` krishna
2004-12-18 14:08 ` Arnd Bergmann [this message]
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