From: Richard Zidlicky <rz@linux-m68k.org>
To: Felix Blanke <felixblanke@gmail.com>
Cc: dm-crypt@saout.de
Subject: Re: [dm-crypt] LUKS - SSD trim
Date: Fri, 23 Apr 2010 00:20:49 +0200 [thread overview]
Message-ID: <20100422222049.GB15879@linux-m68k.org> (raw)
In-Reply-To: <20100422221237.477736d1@gmail.com>
On Thu, Apr 22, 2010 at 10:12:37PM +0200, Felix Blanke wrote:
> scooter ~ # hdparm -tT /dev/sdb3
>
> /dev/sdb3:
> Timing cached reads: 18686 MB in 2.00 seconds = 9354.32 MB/sec
> Timing buffered disk reads: 758 MB in 3.00 seconds = 252.61 MB/sec
>
> scooter ~ # hdparm -tT /dev/mapper/ssd
>
> /dev/mapper/ssd:
> Timing cached reads: 17432 MB in 2.00 seconds = 8725.18 MB/sec
> Timing buffered disk reads: 158 MB in 3.02 seconds = 52.36 MB/sec
>
>
> The first value is perfect, then second one really sucks.
> Obv. /dev/mapper/ssd is the decrypted /dev/sdb3
>
> Any idea about that?
dm-crypt is slow - and when it is read I don't think alignment will do any difference.
loop-AES might be faster.
Richard
next prev parent reply other threads:[~2010-04-22 22:18 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-21 22:48 [dm-crypt] LUKS - SSD trim Felix Blanke
2010-04-21 23:00 ` Milan Broz
2010-04-21 23:03 ` Felix Blanke
2010-04-22 2:17 ` Arno Wagner
2010-04-22 8:42 ` mark
2010-04-22 9:37 ` Milan Broz
2010-04-22 20:12 ` Felix Blanke
2010-04-22 22:20 ` Richard Zidlicky [this message]
2010-04-22 22:22 ` Richard Zidlicky
2010-04-23 8:49 ` Milan Broz
2010-04-23 10:20 ` Mikko Rauhala
2010-04-23 11:13 ` Richard Zidlicky
2010-04-23 11:46 ` Milan Broz
2010-04-23 20:09 ` Richard Zidlicky
2010-04-23 20:45 ` Milan Broz
2010-04-23 22:59 ` Richard Zidlicky
2010-04-24 15:59 ` Arno Wagner
2010-04-24 16:44 ` Richard Zidlicky
2010-04-24 17:01 ` Arno Wagner
2010-04-22 6:17 ` Heinz Diehl
2010-05-14 7:35 ` JG
-- strict thread matches above, loose matches on Subject: below --
2010-05-27 13:14 Christoph Anton Mitterer
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