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
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