Mailinglist Archive: opensuse-factory (949 mails)

[Jan Matejek <jan.matejek@xxxxxxxxxx>]

Dne 28.8.2009 16:17, Jeff Mahoney napsal(a):
> I had another SSD for my Aspire but its performance under dbench is very
> suspect (< 1MB/s despite a hdparm of ~ 60 MB/s), so I haven't included
> those results.

i'd be interested to see those results - can't they be caused by
difference between sequential read/write (hdparm) vs random write (dbench) ?
Article [1] has a very thorough description of how SSDs work and what
affects their performance. It's quite educating but very long read -
what's important here [2], some SSD controller manufacturers (namely
JMicron) design the controller in a way that allows for very fast
sequential writes, sacrificing latency and therefore killing performance
for random writes. (a latency of 500ms per write operation is common).
This way, with a mixture of sequential/random writes, performance could
easily drop.

[1] http://www.anandtech.com/storage/showdoc.aspx?i=3531
[2] http://www.anandtech.com/storage/showdoc.aspx?i=3531&p=17

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