Date:   Thu, 10 Aug 2000 17:25:45 +0200 (CEST)
From:   Thomas Graichen <graichen@innominate.de>
Reply-To: thomas.graichen@innominate.de
To:     Steve Lord <lord@sgi.com>
Cc:     linux-xfs@oss.sgi.com
Subject: Re: TAKE - add runtime configuration for pagebuf 
In-Reply-To: <200008101513.KAA10725@jen.americas.sgi.com>
Message-ID: <Pine.LNX.4.21.0008101723260.5916-100000@h2o.bln.innominate.de>
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On Thu, 10 Aug 2000, Steve Lord wrote:

> > Steve Lord <lord@sgi.com> wrote:
> > > This adds a new /proc/sys/vm/pagebuf interface which lets you
> > > tune a number of pagebuf parameters at runtime. The format is
> > > as follows:
> > 
> > > # cat /proc/sys/vm/pagebuf
> > > 100     1500    100     128     2048
> > 
> > > The numbers are, in order:
> > 
> > >  o sleep interval for the delayed write pagebuf thread - writes out
> > >    dirty metadata, value in HZ
> > 
> > >  o age of delayed write metadata buffers before they are written,
> > >    value in HZ
> > 
> > >  o sleep interval for page cleaner thread, value in HZ
> > 
> > >  o maximum cluster size of I/O for delayed allocation conversions,
> > >    value in pages.
> > 
> > >  o maximum delayed allocate pages allowed before page cleaner thread
> > >    woken up.
> > 
> > are those parameters (and all the other stuff behind /proc/fs/xfs)
> > anywhere documented ? - if not it would be a good idea to leave at
> > least a basic documentation of then in linux/Documentation/sysctl/
> > 
> > just an idea
> 
> You are correct, there needs to be some documentation to go with this,
> I am going to be changing how the sysctl interface is presented to be
> a one parameter per file interface in /proc.
> 
that is much better - combined with good names

> We have a perl script which interprets the xfs statistics, that should
> go into the tree, also the pcp package understands them:
> 
> 	http://oss.sgi.com/projects/pcp/
> 
can you put up this script somewhere into the sources - maybe it can
at least to help finding out the meanings of all the variables ...

> I still need to get back to you on the power pc stuff, I'm a bit buried
> at the moment.
> 
oh yeah - i'm ready :-) - but do all that in the order you like or
have to do it ...

t

-- 
thomas.graichen@innominate.de
technical director                                       innominate AG
clustering & security                                networking people
tel: +49.30.308806-13  fax: -77                   http://innominate.de