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From: Ingo Molnar <mingo@elte.hu>
To: "Stephen C. Tweedie" <sct@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>,
	Linus Torvalds <torvalds@transmeta.com>,
	Christoph Hellwig <hch@caldera.de>, Steve Lord <lord@sgi.com>,
	Linux Kernel List <linux-kernel@vger.kernel.org>,
	<kiobuf-io-devel@lists.sourceforge.net>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait /notify + callback chains
Date: Mon, 5 Feb 2001 23:09:09 +0100 (CET)	[thread overview]
Message-ID: <Pine.LNX.4.30.0102052307560.11396-100000@elte.hu> (raw)
In-Reply-To: <20010205150354.E1167@redhat.com>


On Mon, 5 Feb 2001, Stephen C. Tweedie wrote:

> > Obviously the disk access itself must be sector aligned and the total
> > length must be a multiple of the sector length, but there shouldn't be
> > any restrictions on the data buffers.
>
> But there are. Many controllers just break down and corrupt things
> silently if you don't align the data buffers (Jeff Merkey found this
> by accident when he started generating unaligned IOs within page
> boundaries in his NWFS code). And a lot of controllers simply cannot
> break a sector dma over a page boundary (at least not without some
> form of IOMMU remapping).

so we are putting workarounds for hardware bugs into the design?

	Ingo

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  parent reply	other threads:[~2001-02-05 22:10 UTC|newest]

Thread overview: 201+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-02-01 14:44 [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait /notify + callback chains bsuparna
2001-02-01 15:09 ` Christoph Hellwig
2001-02-01 16:08   ` Steve Lord
2001-02-01 16:49     ` Stephen C. Tweedie
2001-02-01 17:02       ` Christoph Hellwig
2001-02-01 17:34         ` Alan Cox
2001-02-01 17:49           ` Stephen C. Tweedie
2001-02-01 17:09             ` Chaitanya Tumuluri
2001-02-01 20:33             ` Christoph Hellwig
2001-02-01 20:56               ` Steve Lord
2001-02-01 20:59                 ` Christoph Hellwig
2001-02-01 21:17                   ` Steve Lord
2001-02-01 21:44               ` Stephen C. Tweedie
2001-02-01 22:07               ` Stephen C. Tweedie
2001-02-02 12:02                 ` Christoph Hellwig
2001-02-05 12:19                   ` Stephen C. Tweedie
2001-02-05 21:28                     ` Ingo Molnar
2001-02-05 22:58                       ` Stephen C. Tweedie
2001-02-05 23:06                         ` Alan Cox
2001-02-05 23:16                           ` Stephen C. Tweedie
2001-02-06  0:19                         ` Manfred Spraul
2001-02-03 20:28                 ` Linus Torvalds
2001-02-05 11:03                   ` Stephen C. Tweedie
2001-02-05 12:00                     ` Manfred Spraul
2001-02-05 15:03                       ` Stephen C. Tweedie
2001-02-05 15:19                         ` Alan Cox
2001-02-05 17:20                           ` Stephen C. Tweedie
2001-02-05 17:29                             ` Alan Cox
2001-02-05 18:49                               ` Stephen C. Tweedie
2001-02-05 19:04                                 ` Alan Cox
2001-02-05 19:09                                 ` Linus Torvalds
2001-02-05 19:16                                   ` [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait Alan Cox
2001-02-05 19:28                                     ` Linus Torvalds
2001-02-05 20:54                                       ` Stephen C. Tweedie
2001-02-05 21:08                                         ` David Lang
2001-02-05 21:51                                         ` Alan Cox
2001-02-06  0:07                                         ` Stephen C. Tweedie
2001-02-06 17:00                                           ` Christoph Hellwig
2001-02-06 17:05                                             ` Stephen C. Tweedie
2001-02-06 17:14                                               ` Jens Axboe
2001-02-06 17:22                                               ` Christoph Hellwig
2001-02-06 18:26                                                 ` Stephen C. Tweedie
2001-02-06 17:37                                               ` Ben LaHaise
2001-02-06 18:00                                                 ` Jens Axboe
2001-02-06 18:09                                                   ` Ben LaHaise
2001-02-06 19:35                                                     ` Jens Axboe
2001-02-06 18:14                                                 ` Linus Torvalds
2001-02-08 11:21                                                   ` Andi Kleen
2001-02-08 14:11                                                   ` Martin Dalecki
2001-02-08 17:59                                                     ` Linus Torvalds
2001-02-06 18:18                                                 ` Ingo Molnar
2001-02-06 18:25                                                   ` Ben LaHaise
2001-02-06 18:35                                                     ` Ingo Molnar
2001-02-06 18:54                                                       ` Ben LaHaise
2001-02-06 18:58                                                         ` Ingo Molnar
2001-02-06 19:11                                                           ` Ben LaHaise
2001-02-06 19:32                                                             ` Jens Axboe
2001-02-06 19:32                                                             ` Ingo Molnar
2001-02-06 19:32                                                             ` Linus Torvalds
2001-02-06 19:44                                                               ` Ingo Molnar
2001-02-06 19:49                                                               ` Ben LaHaise
2001-02-06 19:57                                                                 ` Ingo Molnar
2001-02-06 20:07                                                                   ` Jens Axboe
2001-02-06 20:25                                                                   ` Ben LaHaise
2001-02-06 20:41                                                                     ` Manfred Spraul
2001-02-06 20:50                                                                       ` Jens Axboe
2001-02-06 21:26                                                                         ` Manfred Spraul
2001-02-06 21:42                                                                           ` Linus Torvalds
2001-02-06 20:16                                                                             ` Marcelo Tosatti
2001-02-06 22:09                                                                               ` Jens Axboe
2001-02-06 22:26                                                                                 ` Linus Torvalds
2001-02-06 21:13                                                                                   ` Marcelo Tosatti
2001-02-06 23:26                                                                                     ` Linus Torvalds
2001-02-07 23:17                                                                                       ` select() returning busy for regular files [was Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait] Pavel Machek
2001-02-08 13:57                                                                                         ` Ben LaHaise
2001-02-08 17:52                                                                                         ` Linus Torvalds
2001-02-08 15:06                                                                                       ` [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait Ben LaHaise
2001-02-08 13:44                                                                                         ` Marcelo Tosatti
2001-02-08 13:45                                                                                           ` Marcelo Tosatti
2001-02-07 23:15                                                                                   ` Pavel Machek
2001-02-08 13:22                                                                                     ` Stephen C. Tweedie
2001-02-08 12:03                                                                                       ` Marcelo Tosatti
2001-02-08 15:46                                                                                         ` Mikulas Patocka
2001-02-08 14:05                                                                                           ` Marcelo Tosatti
2001-02-08 16:11                                                                                             ` Mikulas Patocka
2001-02-08 14:44                                                                                               ` Marcelo Tosatti
2001-02-08 16:57                                                                                               ` Rik van Riel
2001-02-08 17:13                                                                                                 ` James Sutherland
2001-02-08 18:38                                                                                                 ` Linus Torvalds
2001-02-09 12:17                                                                                                   ` Martin Dalecki
2001-02-08 15:55                                                                                           ` Jens Axboe
2001-02-08 18:09                                                                                         ` Linus Torvalds
2001-02-08 14:52                                                                                     ` Mikulas Patocka
2001-02-08 19:50                                                                                       ` Stephen C. Tweedie
2001-02-11 21:30                                                                                       ` Pavel Machek
2001-02-06 21:57                                                                             ` Manfred Spraul
2001-02-06 22:13                                                                               ` Linus Torvalds
2001-02-06 22:26                                                                                 ` Andre Hedrick
2001-02-06 20:49                                                                     ` Jens Axboe
2001-02-07  0:21                                                                   ` Stephen C. Tweedie
2001-02-07  0:25                                                                     ` Ingo Molnar
2001-02-07  0:36                                                                       ` Stephen C. Tweedie
2001-02-07  0:50                                                                         ` Linus Torvalds
2001-02-07  1:49                                                                           ` Stephen C. Tweedie
2001-02-07  2:37                                                                             ` Linus Torvalds
2001-02-07 14:52                                                                               ` Stephen C. Tweedie
2001-02-07 19:12                                                                               ` Richard Gooch
2001-02-07 20:03                                                                                 ` Stephen C. Tweedie
2001-02-07  1:51                                                                           ` Jeff V. Merkey
2001-02-07  1:01                                                                             ` Ingo Molnar
2001-02-07  1:59                                                                               ` Jeff V. Merkey
2001-02-07  1:02                                                                             ` Jens Axboe
2001-02-07  1:19                                                                               ` Linus Torvalds
2001-02-07  1:39                                                                                 ` Jens Axboe
2001-02-07  1:45                                                                                   ` Linus Torvalds
2001-02-07  1:55                                                                                     ` Jens Axboe
2001-02-07  9:10                                                                                     ` David Howells
2001-02-07 12:16                                                                                       ` Stephen C. Tweedie
2001-02-07  2:00                                                                               ` Jeff V. Merkey
2001-02-07  1:06                                                                                 ` Ingo Molnar
2001-02-07  1:09                                                                                   ` Jens Axboe
2001-02-07  1:11                                                                                     ` Ingo Molnar
2001-02-07  1:26                                                                                   ` Linus Torvalds
2001-02-07  2:07                                                                                   ` Jeff V. Merkey
2001-02-07  1:08                                                                                 ` Jens Axboe
2001-02-07  2:08                                                                                   ` Jeff V. Merkey
2001-02-07  1:42                                                                         ` Jeff V. Merkey
2001-02-07  0:42                                                                       ` Linus Torvalds
2001-02-07  0:35                                                                     ` Jens Axboe
2001-02-07  0:41                                                                     ` Linus Torvalds
2001-02-07  1:27                                                                       ` Stephen C. Tweedie
2001-02-07  1:40                                                                         ` Linus Torvalds
2001-02-12 10:07                                                                           ` Jamie Lokier
2001-02-06 20:26                                                                 ` Linus Torvalds
2001-02-06 20:25                                                               ` Christoph Hellwig
2001-02-06 20:35                                                                 ` Ingo Molnar
2001-02-06 19:05                                                                   ` Marcelo Tosatti
2001-02-06 20:59                                                                     ` Ingo Molnar
2001-02-06 21:20                                                                       ` Steve Lord
2001-02-07 18:27                                                                   ` Christoph Hellwig
2001-02-06 20:59                                                                 ` Linus Torvalds
2001-02-07 18:26                                                                   ` Christoph Hellwig
2001-02-07 18:36                                                                     ` Linus Torvalds
2001-02-07 18:44                                                                       ` Christoph Hellwig
2001-02-08  0:34                                                                       ` Neil Brown
2001-02-06 19:46                                                             ` Ingo Molnar
2001-02-06 20:16                                                               ` Ben LaHaise
2001-02-06 20:22                                                                 ` Ingo Molnar
2001-02-06 19:20                                                         ` Linus Torvalds
2001-02-06  0:31                                       ` Roman Zippel
2001-02-06  1:01                                         ` Linus Torvalds
2001-02-06  9:22                                           ` Roman Zippel
2001-02-06  9:30                                           ` Ingo Molnar
2001-02-06  1:08                                         ` David S. Miller
2001-02-05 22:09                         ` Ingo Molnar [this message]
2001-02-05 16:56                       ` [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait /notify + callback chains Linus Torvalds
2001-02-05 17:27                         ` [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait Alan Cox
2001-02-05 16:36                     ` [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait /notify + callback chains Linus Torvalds
2001-02-05 19:08                       ` Stephen C. Tweedie
2001-02-01 17:49           ` Christoph Hellwig
2001-02-01 17:58             ` Alan Cox
2001-02-01 18:32               ` Rik van Riel
2001-02-01 18:59                 ` yodaiken
2001-02-01 19:33             ` Stephen C. Tweedie
2001-02-01 18:51           ` bcrl
2001-02-01 16:16   ` Stephen C. Tweedie
2001-02-01 17:05     ` Christoph Hellwig
2001-02-01 17:09       ` Christoph Hellwig
2001-02-01 17:41       ` Stephen C. Tweedie
2001-02-01 18:14         ` Christoph Hellwig
2001-02-01 18:25           ` Alan Cox
2001-02-01 18:39             ` Rik van Riel
2001-02-01 18:46               ` [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait Alan Cox
2001-02-01 18:48             ` [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait /notify + callback chains Christoph Hellwig
2001-02-01 18:57               ` Alan Cox
2001-02-01 19:00                 ` Christoph Hellwig
2001-02-01 19:32           ` Stephen C. Tweedie
2001-02-01 20:46             ` Christoph Hellwig
2001-02-01 21:25               ` Stephen C. Tweedie
2001-02-02 11:51                 ` Christoph Hellwig
2001-02-02 14:04                   ` Stephen C. Tweedie
2001-02-02  4:18           ` bcrl
2001-02-02 12:12             ` Christoph Hellwig
2001-02-01 20:04         ` Chaitanya Tumuluri
  -- strict thread matches above, loose matches on Subject: below --
2001-02-06 13:50 bsuparna
2001-02-06 14:07 ` Jens Axboe
     [not found] <CA2569EA.00506BBC.00@d73mta05.au.ibm.com>
2001-02-05 15:01 ` Stephen C. Tweedie
2001-02-05 14:31 bsuparna
     [not found] <CA2569E9.004A4E23.00@d73mta05.au.ibm.com>
2001-02-05 12:09 ` Stephen C. Tweedie
2001-02-04 13:24 bsuparna
2001-02-02 15:31 bsuparna
2001-02-01 13:20 bsuparna
2001-02-01  7:58 bsuparna
2001-02-01 12:39 ` Stephen C. Tweedie
2001-02-01  4:55 bsuparna
2001-02-01 12:19 ` Stephen C. Tweedie
2001-02-01 16:30   ` Chaitanya Tumuluri
2001-02-01  3:59 bsuparna
     [not found] <CA2569E5.004D51A7.00@d73mta05.au.ibm.com>
2001-01-31 23:32 ` Stephen C. Tweedie
2001-01-31 13:58 bsuparna
2001-01-30 14:09 bsuparna

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