Date: Wed, 15 Sep 2010 23:05:15 +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: <4C9126FB.2020707@freebsd.org> In-Reply-To: <3F29E8CED7B24805B2D93F62A4EC9559@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>
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on 15/09/2010 23:00 Steven Hartland said the following: > ----- Original Message ----- From: "Andriy Gapon" <avg@freebsd.org> >> Or even try the opposite, if your version of ZFS permits it. >> You can set primarycache=metadata on the filesystem where you have the data that >> you serve via sendfile. With that setting it shouldn't get cached in ARC, but it >> should be still cached in VM cache, so you should get UFS-like behavior. >> >> Will you test it? :) > > Ok given this a whirl, don't have the full results just yet but does seem that > buf cache is not > used at all? > > Mem: 32M Active, 1378M Inact, 159M Wired, 120K Cache, 21M Buf, 5348M Free > Swap: 4096M Total, 4096M Free This was with sendfile enabled? -- Andriy Gapon
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