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Message-ID: <4B9DB0F2.7060808@zytor.com>
Date: Sun, 14 Mar 2010 21:00:50 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Denys Vlasenko <vda.linux@...glemail.com>
CC: Arnd Bergmann <arnd@...db.de>, Tejun Heo <tj@...nel.org>,
"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
lkml <linux-kernel@...r.kernel.org>,
Daniel Taylor <Daniel.Taylor@....com>,
Jeff Garzik <jeff@...zik.org>, Mark Lord <kernel@...savvy.com>,
tytso@....edu, hirofumi@...l.parknet.co.jp,
Andrew Morton <akpm@...ux-foundation.org>,
Alan Cox <alan@...rguk.ukuu.org.uk>, irtiger@...il.com,
Matthew Wilcox <matthew@....cx>, aschnell@...e.de,
knikanth@...e.de, jdelvare@...e.de
Subject: Re: ATA 4 KiB sector issues.
On 03/14/2010 07:26 PM, Denys Vlasenko wrote:
>>
>> Yes, but it does squat for a flash disk that wants, say, 256K alignment.
>
> 4K makes sense. 256K not so much.
>
> 256K alignment is hard to swallow for a lot of reasons anyway.
> Unless the filesystem packs small files into blocks a-la reiserfs,
> 256K block filesystems will be very inefficient for a typical
> storage scenarios.
>
Noone has talked about using 256K filesystem blocks. The fact of the
matter, though, is that both flash and RAID have much larger alignment
requirements than a mere 4K for optimal performance.
You might not like it, but that's the way it is.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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