Mailinglist Archive: opensuse (933 mails)

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Re: [opensuse] openSUSE on SSD?
  • From: David Haller <dnh@xxxxxxxxxxxx>
  • Date: Thu, 3 Jun 2010 00:54:31 +0200
  • Message-id: <20100602225431.GA4230@xxxxxxxxxxxxxxxxxx>
Hello,

On Tue, 01 Jun 2010, Greg Freemyer wrote:
And Ted's post you linked to says Mutt breaks if you simply switch to
noatime without in some way reconfiguring Mutt. (He doesn't provide
details as to how to fix Mutt.)

==== mutt/manual.txt ====
Note: new mail is detected by comparing the last modification time to
the last access time. Utilities like biff or frm or any other program
which accesses the mailbox might cause Mutt to never detect new mail
for that mailbox if they do not properly reset the access time.
Backup tools are another common reason for updated access times.
====

As to the second generation devices which have been around for 18
months now I believe, they are much faster than rotating disk at
random i/o (Approx 15K io's / second), so using noatime with them is
much less of a boost than for rotating disk.

The magazine c't (http://ct.de) from 2010/05/25 has tested new SSDs.
The Crucial CTFDDAC256MAG-1G1 RealSSD reaches seq. reads of 257/322
(min/max) MB/s w/64K blocks, writes 95/221 MB/s and 39300/59755 IO/s
write/read. Intel X25-M G2 172/241, 28/85, 7712/40433.

Oh, and BTW: SSDs use 512K blocks, if you modify a 4k block in the FS,
the SSD neads to read, modify write that block. If now the 8 512B
sectors of a 4k FS-Block span two 512K SSD blocks, the SSD needs to
read, modify, write two such blocks ... So, aligning the FS is
important.

HTH,
-dnh

--
I don't see anything wrong with being arrogant and not at all helpful.
-- Paul Tomblin
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