Mailinglist Archive: opensuse-bugs (2150 mails)

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[Bug 872302] Large delays ( > 10 seconds ) for queries on small firebird databases

https://bugzilla.novell.com/show_bug.cgi?id=872302

https://bugzilla.novell.com/show_bug.cgi?id=872302#c19


Jan Kara <jack@xxxxxxxx> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
InfoProvider| |georg.weickelt@ibedelmann.d
| |e

--- Comment #19 from Jan Kara <jack@xxxxxxxx> 2014-04-22 09:17:59 UTC ---
OK, thanks for checking. So what I suspect now is that there's some process
likely spinning in the kernel for a long time. That would also explain why
default vs desktop kernel flavors make a difference - in the desktop kernel we
are able to preempt a processes running in kernel (unless it holds a spinlock
or explicitly disables preemption) while in the default kernel we can preempt a
process only when it asks to sleep. Do you have softlockup watchdog enabled in
the VM (you can check in /proc/sys/kernel/nmi_watchdog)? If yes, can you
perhaps set /proc/sys/kernel/watchdog_thresh to 5 and see whether kernel
complains about something in kernel logs?

Also can you run top and see whether there are processes in 'R' state for a
long time?

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