Re: md-raid5+lvm+dm-crypt+kvm: one streaming write starves all reads

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Hmm. It used to be that easy a long time ago. Seems the really 
useful parameters are still hidden. I am more than a bit anoyed
by this. Does anybody here know where the eraly flush timeout
can be found? 

Arno


On Fri, Sep 18, 2009 at 11:21:32PM +0200, Sven Eschenberg wrote:
> Erh, no, this would come down to 0.1 seconds (since it's 100th - centi).
> 
> And now, it does not start a flush, it only wakes the daemon up for
> analysis and consideration. If, and how much is flushed depends on other
> tuneables.
> Unfortunately it's not that straight forward.
> 
> Regards
> 
> -Sven
> 
> P.S.: Sorry for the duplicate post with the wrong e-mail addy.
> 
> On Fri, September 18, 2009 23:09, Arno Wagner wrote:
> >
> > A pity. Have you tried to set dirty_writeback_centisecs to
> > something very low, e.g. 10? If I understand this correctly that would
> cause regular flushes to start after 1 sec.
> >
> >
> > Arno
> >
> >
> 
> 
> 
> 
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> 

-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@xxxxxxxxxxx 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 
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