https://bugzilla.novell.com/show_bug.cgi?id=775694 https://bugzilla.novell.com/show_bug.cgi?id=775694#c0 Summary: I/O subsystem completely broken; no multitasking possible Classification: openSUSE Product: openSUSE 12.1 Version: Final Platform: x86-64 OS/Version: Linux Status: NEW Severity: Major Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: mantel@suse.com QAContact: qa-bugs@suse.de Found By: Development Blocker: --- When one process is doing significant I/O, no other process can read or write data and is suspended until the first process finally finishes. How to reproduce: Play some music with your favorite music player. Then in some shell, type something like: cp -a hugefile.in hugefile.out after some seconds, music will stop playing and only continue after the cp has finished. I'm currently copying a 53 GB file and music stopped more than one minute ago! Currently the Linux multitasking is worse than it ever was in Windows a decade ago when it still had "cooperative multitasking". Oh, and it's not the hugetables bug: Mandelbrot:/sys/kernel/mm/transparent_hugepage # cat enabled always madvise [never] Mandelbrot:/sys/kernel/mm/transparent_hugepage # uname -a Linux Mandelbrot 3.1.10-1.9-desktop #1 SMP PREEMPT Thu Apr 5 18:48:38 UTC 2012 (4a97ec8) x86_64 x86_64 x86_64 GNU/Linux Mandelbrot:/sys/kernel/mm/transparent_hugepage # Meanwhile the "cp" has finished and music continues to play. After 2 (TWO!!!) minutes. On a system with 8 GB RAM and core-7 processor. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.