[CentOS] pdflush kernel thread pops up every 10 seconds or so and video decoding grinds to a halt for 1/2 a second
jses27 at gmail.com
Wed Oct 20 13:36:53 UTC 2010
On Tue, 2010-10-19 at 16:34 -0700, Aleksey Tsalolikhin wrote:
> Still seeing the glitch every 5-20 secs after remounting with "commit=6000".
> On Tue, Oct 19, 2010 at 4:00 PM, Ross Walker <rswwalker at gmail.com> wrote:
> > You could also reduce the dirty interval in sysctl so it flushes sooner therefore flushes less data each time.
> OK. It's worth a shot. Any idea what the default value is? I'm not
> sure what value to put in here.
> I know I want to reduce it but I don't want to break my friend's system either.
> 109 dirty_expire_centisecs
> 111 This tunable is used to define when dirty data is old enough to be eligible
> 112 for writeout by the pdflush daemons. It is expressed in 100'ths
> of a second.
> 113 Data which has been dirty in-memory for longer than this interval will be
> 114 written out next time a pdflush daemon wakes up.
Maybe add in this also vm.dirty_ratio = 50 Start at 0 and work your way
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