Date: Wed, 20 Mar 2013 04:38:58 +0100 From: Davide D'Amico <davide.damico@contactlab.com> To: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> Cc: freebsd-fs@freebsd.org Subject: Re: FreBSD 9.1 and ZFS v28 performances Message-ID: <6d4c0172b3aa157a4e80212be4083966@sys.tomatointeractive.it> In-Reply-To: <alpine.GSO.2.01.1303192031480.11141@freddy.simplesystems.org> References: <514729BD.2000608@contactlab.com> <810E5C08C2D149DBAC94E30678234995@multiplay.co.uk> <51473D1D.3050306@contactlab.com> <1DD6360145924BE0ABF2D0979287F5F4@multiplay.co.uk> <51474F2F.5040003@contactlab.com> <E106A7DB08744581A08C610BD8A86560@multiplay.co.uk> <51475267.1050204@contactlab.com> <514757DD.9030705@contactlab.com> <42B9D942BA134E16AFDDB564858CA007@multiplay.co.uk> <1bfdea0efb95a7e06554dadf703d58e7@sys.tomatointeractive.it> <alpine.GSO.2.01.1303192031480.11141@freddy.simplesystems.org>
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Il 20.03.2013 02:34 Bob Friesenhahn ha scritto: > On Mon, 18 Mar 2013, Davide D'Amico wrote: >>> While running the tests what sort of thing are you >>> seeing from gstat, any disks maxing? If so primarily >>> read or write? >> Here the r/w pattern using zpool iostat 2: > > Using 'zpool iostat 2' is not likely to be very useful since zfs > writes all of is data in bursts and may wait up to 5 seconds to do so. > > If your benchmark uses synchronous writes and does continous updates, > then you should see zfs writing continiously to your zil device (or > the pool). And so, considering I'm using an SSD as ZIL device, I don't understand why ZFS performances are so slow (0.5x UFS performances). My benchmark is a set of 50k queries (select, insert, updates) that 'stress' the FS more than the 'simple' oltp tests. Thank, d.
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