Hi all, Firstly, please CC me directly in replies due to not being subscribed.
After a fix to glibc that fixed Unity 3D based games (Fedora ref: https:// bugzilla.redhat.com/show_bug.cgi?id=1440287), I have noticed that when I play Cities: Skylines that the system becomes unresponsive when digging into swap. I have 10Gb of RAM in this system and run Fedora 26. If I launch Cities: Skylines with no swap space, things run well performance wise until I get an OOM - and it all dies - which is expected. When I turn on swap to /dev/sda2 which resides on an SSD, I get complete system freezes while swap is being accessed. The first swap was after loading a saved game, then launching kmail in the background. This caused ~500Mb to be swapped to /dev/sda2 on an SSD. The system froze for about 8 minutes - barely being able to move the mouse. The HDD LED was on constantly during the entire time. To hopefully rule out the above glibc issue, I started the game via jemalloc - but experienced even more severe freezes while swapping. I gave up waiting after 13 minutes of non-responsiveness - not even being able to move the mouse properly. During these hangs, I could typed into a Konsole window, and some of the typing took 3+ minutes to display on the screen (yay for buffers?). I have tested this with both the default vm.swappiness values, as well as the following: vm.swappiness = 1 vm.min_free_kbytes = 32768 vm.vfs_cache_pressure = 60 I noticed that when I do eventually get screen updates, all 8 cpus (4 cores / 2 threads) show 100% CPU usage - and kswapd is right up there in the process list for CPU usage. Sadly I haven't been able to capture this information fully yet due to said unresponsiveness. This seems to be a relatively new problem that I did not encounter during the Fedora 26 beta - but do now. Does anyone have any suggestions on where to start tracking this type of issue down? -- Steven Haigh 📧 [email protected] 💻 http://www.crc.id.au 📞 +61 (3) 9001 6090 📱 0412 935 897
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