Date: Wed, 17 Jun 2009 19:44:07 +0400 (MSD) From: Dmitry Morozovsky <marck@rinet.ru> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: freebsd-hackers@freebsd.org, freebsd-current@freebsd.org, d@delphij.net, Ivan Voras <ivoras@freebsd.org> Subject: Re: tmpfs experimental? Message-ID: <alpine.BSF.2.00.0906171942200.6042@woozle.rinet.ru> In-Reply-To: <alpine.BSF.2.00.0906161327350.27588@wojtek.tensor.gdynia.pl> References: <h162mo$jj2$1@ger.gmane.org> <4A36930F.2000302@delphij.net> <alpine.BSF.2.00.0906161327350.27588@wojtek.tensor.gdynia.pl>
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On Tue, 16 Jun 2009, Wojciech Puchar wrote: WP> > > In other words, is there still reason for the "highly experimental WP> > > feature" warning? WP> > WP> > Last time when I added the warning, it was because some data corruption WP> > issue that can be identified by fsx which I didn't got a chance to WP> > investigate further. I think tmpfs is Ok for some usual work but maybe WP> > not ready for production at that moment. alc@ and kib@ has made a lot WP> > of changes on it recently so perhaps we need to re-visit the problems, WP> > tmpfs would be a great feature for us. WP> WP> as an ordinary user not programmer of tmpfs i can say that: WP> WP> 1) runs fine for months in production environments, including case with over WP> 40 mountpoints (jails) WP> 2) runs really fast when memory is available. WP> 3) performance is bad in case that swapping actually is used. It reads from WP> swap with too small chunks. it's a place for improvement here. WP> WP> Its great thing as it does it properly - memory is immediately freed on WP> delete, and no caching of memory disk like with md(4). Actually, buffer cache is used, so excessive memory usage are still in place; also, on rather heavy tmpfs usage (building large ports, for example) I still can panic and/or hang the machione with exhausted maxswzone, so there definitely is a place to improve things ;) -- Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] [ FreeBSD committer: marck@FreeBSD.org ] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------
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