From: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public•gmane.org>
To: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public•gmane.org>
Cc: andrew.chih.howe.khor-ral2JQCrhuEAvxtiuMwx3w@public•gmane.org,
socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public•gmane.org,
sameo-VuQAYsv1563Yd54FQh9/CA@public•gmane.org,
margie.foster-ral2JQCrhuEAvxtiuMwx3w@public•gmane.org,
netdev-u79uwXL29TY76Z2rM5mHXA@public•gmane.org,
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linux-kernel-u79uwXL29TY76Z2rM5mHXA@public•gmane.org,
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chripell-VaTbYqLCNhc@public•gmane.org,
qi.wang-ral2JQCrhuEAvxtiuMwx3w@public•gmane.org
Subject: Re: [MeeGo-Dev][PATCH v3] Topcliff: Update PCH_CAN driver to 2.6.35
Date: Wed, 06 Oct 2010 11:12:52 +0200 [thread overview]
Message-ID: <4CAC3D94.9010408@grandegger.com> (raw)
In-Reply-To: <20101005.200904.71120150.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
On 10/06/2010 05:09 AM, David Miller wrote:
> From: "Masayuki Ohtake" <masa-korg-ECg8zkTtlr0C6LszWs/t0g@public•gmane.org>
> Date: Wed, 6 Oct 2010 12:07:15 +0900
>
>> Does your mail mean, for accepting upstream, NAPI is essential for
>> CAN driver ?
>
> It is up to the CAN maintainers :-)
Well, our SJA1000 reference driver does still not use NAPI. But NAPI is
for CAN especially useful to avoid the infamous *bus error irq
flooding*, which may hang low end systems if the interrupts are handled
in the IRQ context. Ohtake, if your system can handle well such CAN bus
error irq storms at 1MB/s, then NAPI is *not* a must to have. Anyway, as
you are at it, I also suggest to use NAPI right from the beginning.
Wolfgang.
next prev parent reply other threads:[~2010-10-06 9:12 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4C9C7C6F.1000003@dsn.okisemi.com>
[not found] ` <4C9C7C6F.1000003-ECg8zkTtlr0C6LszWs/t0g@public.gmane.org>
2010-09-27 8:38 ` [MeeGo-Dev][PATCH v3] Topcliff: Update PCH_CAN driver to 2.6.35 Wolfgang Grandegger
2010-09-30 9:10 ` Wolfgang Grandegger
[not found] ` <4CA4541F.5040804-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2010-09-30 18:50 ` David Miller
2010-10-01 10:02 ` Masayuki Ohtake
[not found] ` <000401cb614f$c932c750$66f8800a-a06+6cuVnkTSQfdrb5gaxUEOCMrvLtNR@public.gmane.org>
2010-10-01 12:40 ` Wolfgang Grandegger
2010-10-05 10:21 ` Masayuki Ohtake
2010-10-05 11:08 ` Marc Kleine-Budde
2010-10-05 12:09 ` Masayuki Ohtake
[not found] ` <002e01cb6486$2ed72cc0$66f8800a-a06+6cuVnkTSQfdrb5gaxUEOCMrvLtNR@public.gmane.org>
2010-10-05 18:45 ` David Miller
2010-10-06 3:07 ` Masayuki Ohtake
[not found] ` <000b01cb6503$962bc7f0$66f8800a-a06+6cuVnkTSQfdrb5gaxUEOCMrvLtNR@public.gmane.org>
2010-10-06 3:09 ` David Miller
[not found] ` <20101005.200904.71120150.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2010-10-06 9:12 ` Wolfgang Grandegger [this message]
2010-10-12 7:09 ` Masayuki Ohtake
[not found] ` <000c01cb69dc$5d2aaab0$66f8800a-a06+6cuVnkTSQfdrb5gaxUEOCMrvLtNR@public.gmane.org>
2010-10-12 7:42 ` Wolfgang Grandegger
2010-10-12 7:56 ` Marc Kleine-Budde
2010-10-13 4:23 ` Masayuki Ohtake
[not found] ` <000701cb6a8e$60de6900$66f8800a-a06+6cuVnkTSQfdrb5gaxUEOCMrvLtNR@public.gmane.org>
2010-10-13 7:38 ` Marc Kleine-Budde
2010-10-13 10:09 ` Masayuki Ohtake
[not found] ` <004a01cb6abe$c41a9cc0$66f8800a-a06+6cuVnkTSQfdrb5gaxUEOCMrvLtNR@public.gmane.org>
2010-10-13 11:08 ` Wolfgang Grandegger
2010-10-13 12:05 ` Masayuki Ohtake
2010-09-24 10:24 Masayuki Ohtak
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