How does your partition alignment look for that disk? Or, in other words, what does 'fdisk -l' tell you about this one?
Am 02.11.18 um 13:31 schrieb Stefan Monnier: > For a while now I noticed that aptitude is very slow on one of my > machine (Thinkpad T61) running Debian testing. At first I thought it > was because its disk (a fairly old 120GB SSD) was suffering from some > kind of problem, so I replaced it with an almost new 240GB Samsung 840. > > It seemed to bet better at first, but maybe it was just an impression. > In any case, now it's definitely very slow. Digging more into it, > I found out that part of the problem seems to be very slow writes to > the disk. I can reproduce tests where `dd`ing a 40MB file proceeds at > the ridiculous speed of about 500KB/s (tho sometimes the speed is much > higher). > > I've been using SSD drives on most of my machines for many years now, > and it's the first time I notice such a slow performance. `smartctl` > shows that the drive an not registered any errors at all and has a "wear > leveling" of 18. > > I figured maybe the drive is having trouble for lack of free space which > leads to high load on the "GC", so I did a `fstrim` on / and /home > (both on LVM), which took a bit of time and returned without any > message, which I took to be a positive sign that it managed to do what > it's supposed to. But it made no difference to the performance. > > Any idea? > > > Stefan >
