On Tue, Jun 1, 2010 at 9:18 AM, C
On Tue, Jun 1, 2010 at 14:33, Adam Tauno Williams wrote:
<quote> i cannot over-emphasise how much of a deal it is in practice. Atime updates are by far the biggest IO performance deficiency that Linux has today. Getting rid of atime updates would give us more everyday Linux performance than all the pagecache speedups of the past 10 years, _combined_. </quote>
This is true.
If they had atime, and a slow I/O bus, and then they set noatime [because they thought they should on an SSD] - that might explain some of the performance improvement.
Hmmmm interesting. Well, I just added noatime to the fstab for my various partitions (root, home, etc.) and did a mount -o remount on each partition. Now the test :-) is there any noticeable difference.
I've no doubt start-up times are faster, that I'd suspect, would be a real-world difference. As for me, start-up is pretty fast anyway, I don't startup that often (twice a day?)... so I just don't get what the big deal is. Faster is nice, but really [for me anyway] it doesn't matter.
Yes true. On my mian machine it goes through a startup cycle once a week at most.. more usual is once every month or two.
For good SSD's there is a real difference when you are doing a high rate of *random* and *small* read/writes. Like with an RDBMS, especially for a database journal/log partition.
Aha, that would do it. Interesting information so far... and now with noatime set on all my partitions... well, I have to wait a bit to see if it helps.
you also have many services spinning up at once]. But once you are logged in and working, just about everything you want should be at least partially in RAM already.
On my main machine I've got 8GB of RAM. The difference between say.. 2Gb of RAM and 8GB is night and day with Linux.
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FYI: I started to put some info together related to SSDs and trim that adds to this discussion. http://en.opensuse.org/User:Gregfreemyer The new wiki is supposed to go live shortly, so I haven't tried to figure out how to create a SSD page in the new wiki. If someone knows and to do that, feel free to move my content there and this thread has had some useful info that could also be added to the page. Greg -- Greg Freemyer Head of EDD Tape Extraction and Processing team Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer CNN/TruTV Aired Forensic Imaging Demo - http://insession.blogs.cnn.com/2010/03/23/how-computer-evidence-gets-retriev... The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org