From: Lutz Vieweg <lvml@5t9.de>
To: linux-raid@vger.kernel.org
Subject: Re: Software RAID and TRIM
Date: Wed, 20 Jul 2011 14:20:08 +0200 [thread overview]
Message-ID: <j06h5o$ebm$1@dough.gmane.org> (raw)
In-Reply-To: <j0613g$aoe$1@dough.gmane.org>
On 07/20/2011 09:42 AM, David Brown wrote:
>> http://tdm27.wordpress.com/2011/07/19/some-solid-state-drive-benchmarks/
>
> The telling figure here, though, is that TRIM made the single drive significantly slower.
More precisely, online-TRIM of ext4 on Intel SSDs seems to be a bad combination.
I think it's clear you cannot gain much from TRIM if you're willing to spend
the money for 2 times overprovisioning, anyway. You can lose significantly from
online-trim when the filesystem issues a lot of TRIM commands all the time and
when the SSD is slow to process them.
TRIM gains you an advantage with less over-provisioning, and is better
done in batches after significant amounts of data have been written/deleted.
When you try with different levels of over-provisioning, also try with
batched discards (fstrim) between runs of your benchmark.
Regards,
Lutz Vieweg
next prev parent reply other threads:[~2011-07-20 12:20 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-28 15:31 Software RAID and TRIM Tom De Mulder
2011-06-28 16:11 ` Mathias Burén
2011-06-29 10:32 ` Tom De Mulder
2011-06-29 10:45 ` NeilBrown
2011-06-29 11:10 ` Tom De Mulder
2011-06-29 11:48 ` Scott E. Armitage
2011-06-29 12:46 ` Roberto Spadim
2011-06-29 12:46 ` David Brown
2011-06-30 0:28 ` NeilBrown
2011-06-30 7:50 ` David Brown
2011-06-29 13:39 ` Namhyung Kim
2011-06-30 0:27 ` NeilBrown
2011-07-17 22:11 ` Lutz Vieweg
2011-07-17 21:57 ` Lutz Vieweg
2011-06-29 10:33 ` Tom De Mulder
2011-06-29 12:42 ` David Brown
2011-06-29 12:55 ` Tom De Mulder
2011-06-29 13:02 ` Roberto Spadim
2011-06-29 13:10 ` David Brown
2011-06-30 5:51 ` Mikael Abrahamsson
2011-07-04 9:13 ` Tom De Mulder
2011-07-04 16:26 ` Werner Fischer
2011-07-17 22:31 ` Lutz Vieweg
2011-07-17 22:16 ` Lutz Vieweg
2011-07-17 22:00 ` Lutz Vieweg
2011-06-28 16:17 ` Johannes Truschnigg
2011-06-28 16:40 ` David Brown
2011-07-17 21:52 ` Lutz Vieweg
2011-07-18 5:14 ` Mikael Abrahamsson
2011-07-18 10:35 ` David Brown
2011-07-18 10:48 ` Tom De Mulder
2011-07-18 18:09 ` Lutz Vieweg
2011-07-18 20:18 ` David Brown
2011-07-19 9:29 ` Lutz Vieweg
2011-07-19 10:22 ` David Brown
2011-07-19 13:41 ` Lutz Vieweg
2011-07-19 15:06 ` David Brown
2011-07-20 10:39 ` Lutz Vieweg
2011-07-19 14:19 ` Tom De Mulder
2011-07-20 7:42 ` David Brown
2011-07-20 12:20 ` Lutz Vieweg [this message]
2011-07-20 12:13 ` Werner Fischer
2011-07-20 12:25 ` Lutz Vieweg
2011-07-18 10:53 ` Tom De Mulder
2011-07-18 12:13 ` Werner Fischer
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