From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans Reiser Subject: Re: tail policy question Date: Wed, 12 Nov 2003 04:56:38 -0800 Message-ID: <3FB22E06.9070500@namesys.com> References: Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com In-Reply-To: List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Zhihui Zhang Cc: reiserfs-list@namesys.com, vs@namesys.com Zhihui Zhang wrote: >Hi, > >I spent a little time on Reiser4 tail code and was surprised to find out >that the default policy given in reiser4.h is ALWAYS_TAIL_ID not >DEFAULT_TAIL_ID. > >/* default tail policy plugin */ >#define REISER4_TAIL_PLUGIN (ALWAYS_TAIL_ID) > >Does this mean Reiser4 always use tails no matter how large a file is by >default? I must be wrong somewhere. > > Umh, we are often capable of incredible stupidity as a result of someone testing some setting and then checking it in by accident. You want the default not the always. >Anyway, when tails are in use, will they incur more or less performance >penalty on files using them when compared to ReiserFS V3 (remember that >-notail mount option is sometimes preferred)? > It is not nearly that bad, but you want the default. I'll let Saveliev comment further. Thanks for finding this. -- Hans