2
Following the outbreak of KPTI news, I recently updated my kernel to 4.14.11-300. In addition to a quite sufficient RAM (8 GB) and fast IO (SSD disk), I have started to feel remarkable slowdown in my system performance when I am mulitasking for example editing code and perform some other not-so-resource-intensive jobs, especially when I run out of physical RAM and switch to swap, which is hosted on SSD disk. I read in article, that you can disable the new imposed performance hit using the nopti
option. I did not find any command on my Fedora 26 as nopti
. Where should I use this feature and how?
2I don't think you should see "remarkable slowdown" when you are doing tasks like editing code. I'd investigate to make sure something else isn't causing issues and the KPTI patch just a coincidence. – mattdm – 2018-01-08T22:51:16.817
I would bet that your "remarkable slowdown" is caused solely by running out of RAM. Try to kill some processes to increase the amount of "MemAvailable" RAM in
/proc/meminfo
and you should see improved performance. Note that the "MemAvailable" includes all caches and buffers so if you're running low, the system has to deal with lower cache and buffer sizes and the performance will suffer. – Mikko Rantalainen – 2018-10-01T07:07:50.427