From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Mason <mason@suse.com>
Subject: Re: udpated data logging available
Date: 01 Jul 2003 21:46:23 -0400
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To: Manuel Krause <manuelkrause@netscape.net>
Cc: Dieter =?ISO-8859-1?Q?N=FCtzel?= <Dieter.Nuetzel@hamburg.de>, reiserfs-list <reiserfs-list@namesys.com>

On Tue, 2003-07-01 at 20:46, Manuel Krause wrote:
>  
> > Setting HZ=1000 (from 100) in linux/include/asm/param.h give me very 
> > impressive latency boost. 2.4.21-rc1-jam1 (-rc1aa1)
> 
> Just tried this HZ=1000 setting, too.
> 
> (With the following patches "only": data-logging, search_reada-4 and
> rml-preempt on 2.4.21-final, and AA.00_nanosleep-6.diff (THAT ONE
> decreased my VMware+system CPU idle usage in these circumstances by
> approx. 1/2 [from 25% to approx. 12.5%] ).
> 

Some userspace tools depend on the HZ value.  It's clear the io-stalls-7
patch can't be the final one, I need to add userspace knobs to tune
things towards latency or multi-writer throughput (basically server or
desktop workloads).

-chris