From: "H. Peter Anvin" <hpa@zytor.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Karel Zak <kzak@redhat.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
util-linux-ng@vger.kernel.org
Subject: Re: [ANNOUNCE] util-linux-ng v2.17 (stable)
Date: Mon, 11 Jan 2010 08:52:56 -0800 [thread overview]
Message-ID: <4B4B5768.2040005@zytor.com> (raw)
In-Reply-To: <20100111140255.GA1416@ucw.cz>
On 01/11/2010 06:05 AM, Pavel Machek wrote:
> On Fri 2010-01-08 13:43:47, H. Peter Anvin wrote:
>> On 01/08/2010 01:33 AM, Karel Zak wrote:
>>>
>>> fdisk:
>>> - the fdisk command aligns newly created partitions to minimum_io_size
>>> boundary ("minimum_io_size" is physical sector size or stripe chunk
>>> size on RAIDs).
>>>
>>> - the fdisk command supports disks with alignment_offset now.
>>>
>>
>> I think we should align, by default, much more aggressively than that --
>> because frequently we just don't know what the real physical alignment
>> is (think of flash media, which uses large erase blocks underneath.)
>
> Flash has special mapping layer, and does not care (SD/MMC), or is a
> raw nand and can't be used as block device (smartmedia).
>
Uhm, that's just plain wrong.
It doesn't matter if there is a "special mapping layer" -- if you're
crossing multiple erase blocks you're still having more churn in your
flash translation layer, with more wear on the device, and lower
performance than if you didn't.
-hpa
next prev parent reply other threads:[~2010-01-11 16:53 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-08 9:33 [ANNOUNCE] util-linux-ng v2.17 (stable) Karel Zak
2010-01-08 21:43 ` H. Peter Anvin
2010-01-08 22:40 ` Andreas Dilger
2010-01-08 23:33 ` H. Peter Anvin
2010-01-11 6:36 ` Martin K. Petersen
2010-01-11 7:27 ` H. Peter Anvin
2010-01-11 14:05 ` Pavel Machek
2010-01-11 16:52 ` H. Peter Anvin [this message]
2010-01-11 20:17 ` Pavel Machek
2010-01-11 23:26 ` H. Peter Anvin
2010-01-12 13:33 ` Artem Bityutskiy
2010-01-12 13:35 ` Artem Bityutskiy
2010-01-11 19:17 ` Artem Bityutskiy
2010-01-12 7:19 ` Jörn Engel
2010-01-12 8:19 ` H. Peter Anvin
2010-01-12 9:37 ` Jörn Engel
2010-01-12 16:20 ` H. Peter Anvin
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