A few notes on SSDs in Laptops
I've now had the SSD in my laptop for about 10 days. Its made a massive difference to the way I work.
Its striking as to how much of a difference having this extra performance in the laptop would make. In march I upgraded the memory on this laptop from 2GB to 8GB - which also made a massive difference, specially since I almost never reboot the device and the filesystem cache get very good at handling just the right kind of stuff - but what kills them is my email ( ~ 30 gb ) and VMs ( upto 5 running at any given time ). Having the SSD now means that I no longer need to drop back to 10 seconds for jedit startup after I've been running a couple of VMs.
One thing that hasn't gone quite to expectation is the battery life. The HP 2540p had ~ 4 hrs or so, doing what I do, when I got it new. That had dropped to just over 3 hrs with the 250gb sata disk in. With the SSD its now gone to 2 hrs ~30 min or so. Initially that felt quite strange, I was expecting it to go in the other direction. And while I havent been able to put a finger on exactly what this is, it seems like there are 2 interesting side effects from the SSD upgrade.
1) The four cores on this i5 laptop now run at full speed ( 2.53 Ghz ) a lot more often than they did in the past, trending this over the last 48 hrs and its averaged 1.87Ghz; Not sure what it was earlier but the cpu governors used to stay blue a lot more than they do now.
2) Heat. The cooling fan is on a lot more, and the heat vent seems a lot warmer than it ever did in the past. This might be due to the cpus running a lot faster, a lot more. The disk itself does not 'seem' to be any warmer. The bottom left side of the laptop which houses the disk feels cool.
The big win of-course, is performance of everything. Almost every app just starts in place ( even eclipse! ). Doing a search in large code projects is instantaneous. Git operations are visibly quicker. Even using svn isn't nearly as boring as it used to be, if I can stop adding -a to all my svn commits it would not get in my way.
The only thing that isn't quite as quick as it needs to be on this machine now is the graphics interface ( intel HD ).
Also worth keeping in mind is that use CentOS-6 for the SSD hosted content, and make sure you have 'discard' enabled as a mount option.
Interesting that you are running jEdit? What were the reasons behind that? Was vim not good enough?
I use Vim as well, I use Eclipse as well. But mostly I like Jedit, it works. Only thing missing really is a good git plugin
The manufacturers just ignored power consumption and are still starting to wake up from this mistake :(
I have ext4/discard on - afaik, that should take care of the trim stuff.
Do you have some stats / details to share about the power issue ?
Scientific Linux and Fedora definitively load and run slower than it should be, on laptops with SSD, but I did not check the temperature of the SSDs.
Running Debian Squeeze on SSD laptops shows significant higher speed and absolutely no heat from SSD..
I thought it may be the kernel versions, but Fedora has newer kernel than Debian, but it is still slower, however I did not check the temperature of the SSD running fedora.
It seem that all RedHat derivatives shows a slowing down of speed and heated SSDs.
Since we were not aware about this issue, this is just a empiric report, but we can do more rigorous quantification and analysis, to draw the right conclusions.
Meanwhile, if anyone has solutions or explanations, it would be great, I would like to know them.
Unfortunately, this means more batter drain for you :P