Date: Wed, 30 Jan 2008 20:16:33 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-performance@freebsd.org Subject: Re: postgresql-performance using sysbench Message-ID: <47A0CD11.802@FreeBSD.org> In-Reply-To: <fnpjvo$n8i$1@ger.gmane.org> References: <b41c75520801280701x35e628dk90841b55cac77045@mail.gmail.com> <fnl35p$hnj$1@ger.gmane.org> <200801281024.11571.darcyb@commandprompt.com> <b41c75520801281221i5fbb32f3p1e2f3be40a8dfa74@mail.gmail.com> <479E3C5E.1070405@FreeBSD.org> <b41c75520801281246q16d305ecue915e66bea6ac5ab@mail.gmail.com> <fnmrri$pi4$1@ger.gmane.org> <b41c75520801290146g4e6e2c17oe2fc432245253ba7@mail.gmail.com> <47A043FD.9090607@FreeBSD.org> <fnpjvo$n8i$1@ger.gmane.org>
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Ivan Voras wrote: > Kris Kennaway wrote: > >> Write performance is something that we are working on, expect to hear >> about progress over the coming weeks/months. > > Do you have some notes or descriptions about what is being worked on? > I'm currently doing some file system benchmarking for internal purposes > and I'm seeing sequential read/write performance nontrivially lower on > FreeBSD+UFS than on Linux+ext3. The Linux combination has ~~20% faster > writes and ~~60% faster reads, on a hardware RAID10 of four 15kRPM > drives, IBM ServeRAID 8 (file system ops / nonsequential are worse - > send me a private message for details). Is the work that's been going on > about lock contention or something at the low levels of the file system? > Rewrite of the lockmgr primitive, for starters. Then we'll see what remains. Kris
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