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Date: Thu, 7 Nov 2002 18:19:49 +0100
From: Pavel Machek <pavel@ucw.cz>
To: Daniel Egger <degger@fhm.edu>
Cc: reiser@namesys.com, lkml <linux-kernel@vger.kernel.org>
Subject: Re: [BK][PATCH] Reiser4, will double Linux FS performance, pleaseapply
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Hi!

> > There is also a longer PhD thesis by her.  10 minutes is about as much 
> > work as I personally am willing to lose and try to remember.  Avoiding 
> > 75% of writes instead of 20% is a substantial performance gain worth 
> > paying a cost for.  Unfortunately it is not easy to say if it is worth 
> > that much cost, but I suspect it is.  An approach we are exploring is 
> > for blocks to reach disk earlier than that if the device is not 
> > congested, on the grounds that if not much IO is occuring, then 
> > performance is not important.
> 
> Assuming your 10 minutes are just a default and tunable by sysctl I
> hardly can see any problems at all. Paranoid people can set it to 
> make any tradeoff between performance and speed they'd like including
> setting it to 0, no?

It has traditionaly been 30 seconds, so I'd suggest default stays.

								Pavel
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