From: Arnd Bergmann <arnd@arndb.de>
To: Andrei Warkentin <andreiw@motorola.com>
Cc: linux-arm-kernel@lists.infradead.org,
Linus Walleij <linus.walleij@linaro.org>,
linux-mmc@vger.kernel.org
Subject: Re: MMC quirks relating to performance/lifetime.
Date: Tue, 22 Feb 2011 17:49:13 +0100 [thread overview]
Message-ID: <201102221749.13992.arnd@arndb.de> (raw)
In-Reply-To: <AANLkTikZh10-2_BLqq0DOm67xZCAEsW9FaRw=+sh+GTY@mail.gmail.com>
On Tuesday 22 February 2011, Andrei Warkentin wrote:
> On Sun, Feb 20, 2011 at 9:23 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> > The description of the test case is probably suboptimal. What this does
> > is 32 KB accesses, with 32 KB alignment in the pre and post case, but 16 KB
> > alignment in the "on" case. The idea here is that it should never do
> > any access with less than "--blocksize" aligment.
> >
>
> Now I feel slightly confused :(.
>
> -b 16384 implies blocksize = 16384, maxalign is 8mb due to count 32,
>
> ret = time_rw_interval(dev, count, pre, blocksize,
> align - blocksize, maxalign,
> do_write); //
> <----------------- read 16k at align - 16k with 8mb intervals?
> returnif(ret);
>
> ret = time_rw_interval(dev, count, on, blocksize,
> align - blocksize / 2, maxalign,
> do_write); //
> <----------------- read 16k at align - 8k with 8mb intervals?
> returnif(ret);
>
> ret = time_rw_interval(dev, count, post, blocksize,
> align, maxalign, do_write); //
> <-------- read 16k at align with 8mb intervals?
> returnif(ret);
>
> I hope I'm not missing something obvious...
No, you are absolutely right. I think I changed this once and no longer
remembered what the final version did.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: MMC quirks relating to performance/lifetime.
Date: Tue, 22 Feb 2011 17:49:13 +0100 [thread overview]
Message-ID: <201102221749.13992.arnd@arndb.de> (raw)
In-Reply-To: <AANLkTikZh10-2_BLqq0DOm67xZCAEsW9FaRw=+sh+GTY@mail.gmail.com>
On Tuesday 22 February 2011, Andrei Warkentin wrote:
> On Sun, Feb 20, 2011 at 9:23 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> > The description of the test case is probably suboptimal. What this does
> > is 32 KB accesses, with 32 KB alignment in the pre and post case, but 16 KB
> > alignment in the "on" case. The idea here is that it should never do
> > any access with less than "--blocksize" aligment.
> >
>
> Now I feel slightly confused :(.
>
> -b 16384 implies blocksize = 16384, maxalign is 8mb due to count 32,
>
> ret = time_rw_interval(dev, count, pre, blocksize,
> align - blocksize, maxalign,
> do_write); //
> <----------------- read 16k@align - 16k with 8mb intervals?
> returnif(ret);
>
> ret = time_rw_interval(dev, count, on, blocksize,
> align - blocksize / 2, maxalign,
> do_write); //
> <----------------- read 16k@align - 8k with 8mb intervals?
> returnif(ret);
>
> ret = time_rw_interval(dev, count, post, blocksize,
> align, maxalign, do_write); //
> <-------- read 16k@align with 8mb intervals?
> returnif(ret);
>
> I hope I'm not missing something obvious...
No, you are absolutely right. I think I changed this once and no longer
remembered what the final version did.
Arnd
next prev parent reply other threads:[~2011-02-22 16:49 UTC|newest]
Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-08 21:22 MMC quirks relating to performance/lifetime Andrei Warkentin
2011-02-08 21:38 ` Wolfram Sang
2011-02-08 21:38 ` Wolfram Sang
2011-02-08 22:42 ` Russell King - ARM Linux
2011-02-09 8:37 ` Linus Walleij
2011-02-09 8:37 ` Linus Walleij
2011-02-09 9:13 ` Arnd Bergmann
2011-02-09 9:13 ` Arnd Bergmann
2011-02-11 22:33 ` Andrei Warkentin
2011-02-11 22:33 ` Andrei Warkentin
2011-02-12 17:05 ` Arnd Bergmann
2011-02-12 17:05 ` Arnd Bergmann
2011-02-12 17:33 ` Andrei Warkentin
2011-02-12 17:33 ` Andrei Warkentin
2011-02-12 18:22 ` Arnd Bergmann
2011-02-12 18:22 ` Arnd Bergmann
2011-02-18 1:10 ` Andrei Warkentin
2011-02-18 1:10 ` Andrei Warkentin
2011-02-18 13:44 ` Arnd Bergmann
2011-02-18 13:44 ` Arnd Bergmann
2011-02-18 19:47 ` Andrei Warkentin
2011-02-18 19:47 ` Andrei Warkentin
2011-02-18 22:40 ` Andrei Warkentin
2011-02-18 22:40 ` Andrei Warkentin
2011-02-18 23:17 ` Andrei Warkentin
2011-02-18 23:17 ` Andrei Warkentin
2011-02-19 11:20 ` Arnd Bergmann
2011-02-19 11:20 ` Arnd Bergmann
2011-02-20 5:56 ` Andrei Warkentin
2011-02-20 5:56 ` Andrei Warkentin
2011-02-20 15:23 ` Arnd Bergmann
2011-02-20 15:23 ` Arnd Bergmann
2011-02-22 7:05 ` Andrei Warkentin
2011-02-22 7:05 ` Andrei Warkentin
2011-02-22 16:49 ` Arnd Bergmann [this message]
2011-02-22 16:49 ` Arnd Bergmann
2011-02-19 9:54 ` Arnd Bergmann
2011-02-19 9:54 ` Arnd Bergmann
2011-02-20 4:39 ` Andrei Warkentin
2011-02-20 4:39 ` Andrei Warkentin
2011-02-20 15:03 ` Arnd Bergmann
2011-02-20 15:03 ` Arnd Bergmann
2011-02-22 6:42 ` Andrei Warkentin
2011-02-22 6:42 ` Andrei Warkentin
2011-02-22 16:42 ` Arnd Bergmann
2011-02-22 16:42 ` Arnd Bergmann
2011-02-11 23:23 ` Linus Walleij
2011-02-11 23:23 ` Linus Walleij
2011-02-12 10:45 ` Arnd Bergmann
2011-02-12 10:45 ` Arnd Bergmann
2011-02-12 10:59 ` Russell King - ARM Linux
2011-02-12 10:59 ` Russell King - ARM Linux
2011-02-12 16:28 ` Arnd Bergmann
2011-02-12 16:28 ` Arnd Bergmann
2011-02-12 16:37 ` Russell King - ARM Linux
2011-02-12 16:37 ` Russell King - ARM Linux
2011-02-11 22:27 ` Andrei Warkentin
2011-02-11 22:27 ` Andrei Warkentin
2011-02-12 18:37 ` Arnd Bergmann
2011-02-12 18:37 ` Arnd Bergmann
2011-02-13 0:10 ` Andrei Warkentin
2011-02-13 0:10 ` Andrei Warkentin
2011-02-13 17:39 ` Arnd Bergmann
2011-02-13 17:39 ` Arnd Bergmann
2011-02-14 19:29 ` Andrei Warkentin
2011-02-14 19:29 ` Andrei Warkentin
2011-02-14 20:22 ` Arnd Bergmann
2011-02-14 20:22 ` Arnd Bergmann
2011-02-14 22:25 ` Andrei Warkentin
2011-02-14 22:25 ` Andrei Warkentin
2011-02-15 17:16 ` Arnd Bergmann
2011-02-15 17:16 ` Arnd Bergmann
2011-02-17 2:08 ` Andrei Warkentin
2011-02-17 2:08 ` Andrei Warkentin
2011-02-17 15:47 ` Arnd Bergmann
2011-02-17 15:47 ` Arnd Bergmann
2011-02-20 11:27 ` Andrei Warkentin
2011-02-20 11:27 ` Andrei Warkentin
2011-02-20 14:39 ` Arnd Bergmann
2011-02-20 14:39 ` Arnd Bergmann
2011-02-22 7:46 ` Andrei Warkentin
2011-02-22 7:46 ` Andrei Warkentin
2011-02-22 17:00 ` Arnd Bergmann
2011-02-22 17:00 ` Arnd Bergmann
2011-02-23 10:19 ` Andrei Warkentin
2011-02-23 10:19 ` Andrei Warkentin
2011-02-23 16:09 ` Arnd Bergmann
2011-02-23 16:09 ` Arnd Bergmann
2011-02-23 22:26 ` Andrei Warkentin
2011-02-23 22:26 ` Andrei Warkentin
2011-02-24 9:24 ` Arnd Bergmann
2011-02-24 9:24 ` Arnd Bergmann
2011-02-25 11:02 ` Andrei Warkentin
2011-02-25 11:02 ` Andrei Warkentin
2011-02-25 12:21 ` Arnd Bergmann
2011-02-25 12:21 ` Arnd Bergmann
2011-03-01 18:48 ` Jens Axboe
2011-03-01 18:48 ` Jens Axboe
2011-03-01 19:11 ` Arnd Bergmann
2011-03-01 19:11 ` Arnd Bergmann
2011-03-01 19:15 ` Jens Axboe
2011-03-01 19:15 ` Jens Axboe
2011-03-01 19:51 ` Arnd Bergmann
2011-03-01 19:51 ` Arnd Bergmann
2011-03-01 21:33 ` Andrei Warkentin
2011-03-01 21:33 ` Andrei Warkentin
2011-03-02 10:34 ` Andrei Warkentin
2011-03-02 10:34 ` Andrei Warkentin
2011-03-05 9:23 ` Andrei Warkentin
2011-03-05 9:23 ` Andrei Warkentin
2011-02-11 14:41 ` Pavel Machek
2011-02-11 14:51 ` Arnd Bergmann
2011-02-11 15:20 ` Lei Wen
2011-02-11 15:25 ` Arnd Bergmann
2011-03-08 6:59 ` Pavel Machek
2011-03-08 14:03 ` Arnd Bergmann
2011-03-08 14:03 ` Arnd Bergmann
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