linux-kernel - Re: [ANNOUNCE] util-linux-ng v2.17 (stable)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 11 Jan 2010 08:52:56 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Pavel Machek <pavel@....cz>
CC:	Karel Zak <kzak@...hat.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, util-linux-ng@...r.kernel.org
Subject: Re: [ANNOUNCE] util-linux-ng v2.17 (stable)

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/