Date: Tue, 21 Sep 2010 12:49:04 +0300 From: Andriy Gapon <avg@freebsd.org> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-fs@freebsd.org Subject: Re: zfs very poor performance compared to ufs due to lack of cache? Message-ID: <4C987F90.6000006@freebsd.org> In-Reply-To: <1E0B9C1145784776A773B99FC1139CD5@multiplay.co.uk> References: <5DB6E7C798E44D33A05673F4B773405E@multiplay.co.uk><AANLkTikNhsj5myhQCoPaNytUbpHtox1vg9AZm1N-OcMO@mail.gmail.com><4C85E91E.1010602@icyb.net.ua><4C873914.40404@freebsd.org><20100908084855.GF2465@deviant.kiev.zoral.com.ua><4C874F00.3050605@freebsd.org><A6D7E134B24F42E395C30A375A6B50AF@multiplay.co.uk><4C8D087B.5040404@freebsd.org><03537796FAB54E02959E2D64FC83004F@multiplay.co.uk><4C8D280F.3040803@freebsd.org><3FBF66BF11AA4CBBA6124CA435A4A31B@multiplay.co.uk><4C8E4212.30000@freebsd.org> <B98EBECBD399417CA5390C20627384B1@multiplay.co.uk> <D79F15FEB5794315BD8668E40B414BF0@multiplay.co.uk> <4C90B4C8.90203@freebsd.org> <6DFACB27CA8A4A22898BC81E55C4FD36@multiplay.co.uk> <4C90D3A1.7030008@freebsd.org> <0B1A90A08DFE4ADA9540F9F3846FDF38@multiplay.co.uk> <4C90EDB8.3040709@freebsd.org> <3F29E8CED7B24805B2D93F62A4EC9559@multiplay.co.uk> <4C9126FB.2020707@freebsd.org> <1E0B9C1145784776A773B99FC1139CD5@multiplay.co.uk>
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on 21/09/2010 12:27 Steven Hartland said the following: > forces into Inact and ARC never seems to push back to balance this out :( Just a general note here. ARC is not designed to "push back". It's designed to give up memory under pressure, it's designed to expand into free space, it's not designed to create the pressure. Incorrect language produces incorrect perception resulting in incorrect expectations. -- Andriy Gapon
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