It is slow, but I found out the reason… However in order to avoid this slowness, I will must not use an important feature of the operating system.
Since the upgrade to 9.04, I noticed that the hard disk led was blinking long minutes. Updating software took long minutes, however downloading was quit fast. Tried to investigate with atop, tried to kill processes that appeared to access the hard disk etc. No real improvement. Often the system seemed to be freezing…
But after investigating few hours, the unexpected result came out. It was difficult to find the cause because the bad was not always happening. And finally I remarked that the difference was between rebooting and restarting from suspend! And the hdparm test hast confirmed it:
sudo hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 1978 MB in 2.00 seconds = 988.92 MB/sec
Timing buffered disk reads: 162 MB in 3.08 seconds = 52.64 MB/sec
misi@kaktusz:~$ sudo hdparm -tT /dev/sda/dev/sda:
Timing cached reads: 1072 MB in 2.00 seconds = 536.09 MB/sec
Timing buffered disk reads: 4 MB in 5.50 seconds = 744.96 kB/sec
The funny thing is that the rest of the hard disks were behaving normally after suspend, so only the root filesystems hard disk was the evil…
So… is this a bug in kernel (2.6.28-11-generic)?
Anyway, for me the solution is to avoid suspend, shut down, and boot when needed, but wait 50000 seconds for boot 