http://bugzilla.opensuse.org/show_bug.cgi?id=1159882 Bug ID: 1159882 Summary: Excessive swapping when buffers / cache expand beyond free physical RAM Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: x86-64 OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel Assignee: kernel-maintainers@forge.provo.novell.com Reporter: rs.opensuse@spitzenpfeil.org QA Contact: qa-bugs@suse.de Found By: --- Blocker: --- User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.88 Safari/537.36 Build Identifier: https://forums.opensuse.org/showthread.php/538586-observing-excessive-swappi... --- Same behavior here: Started dd if=/dev/sdc of=/dev/null bs=4M with no swap being active. Everything was fine until I turned swap on. The machine would freeze immediately. Swapoff runs for minutes until finally succeeding. I think it is a kernel bug. --- Reproducible: Always Steps to Reproduce: 1. copy large file (e.g. 2x RAM size) with cp / use dd that triggers block device caching, eventually swap 2. watch system suffer from high iowait on device holding root-fs & swap Actual Results: Do NOT increasing cache beyond free physical RAM size by swapping Expected Results: Smooth operation, no lags -- You are receiving this mail because: You are on the CC list for the bug.