Date: Thu, 13 Nov 2003 11:33:31 +0100 (CET) From: Martin Blapp <mb@imp.ch> To: Scott Long <scottl@FreeBSD.org> Cc: freebsd-scsi@FreeBSD.org Subject: Very bad FreeBSD SCSI RAID5 write speed performance Message-ID: <20031113084355.P13503@cvs.imp.ch> In-Reply-To: <20031112172306.J4572@pooker.samsco.home> References: <20031112172306.J4572@pooker.samsco.home>
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Hi all, We are currently testing some raid configurations with Linux and FreeBSD. It seems that FreeBSD does something wrong. An adaptec 3200S controller and a IBM ServeRaid5i controller are both times slower with RAID5 on FreeBSD as they are on linux. Both controllers are batterie-backed, have cacheing enabled. Does anyone with these controllers (drivers) can take some numbers of the write-performance ? If needed I can provide numbers (taken with iozone). I've tested it on a async mounted filesystem on both FreeBSD and Linux. And it is not only a benchmark problem. We suffer on this problem on production machines. The production machines perform a bit better since they run 4.X, but still bad (Linux is 3,5 times faster), on CURRENT Linux is 4 times faster. Martin Martin Blapp, <mb@imp.ch> <mbr@FreeBSD.org> ------------------------------------------------------------------ ImproWare AG, UNIXSP & ISP, Zurlindenstrasse 29, 4133 Pratteln, CH Phone: +41 61 826 93 00 Fax: +41 61 826 93 01 PGP: <finger -l mbr@freebsd.org> PGP Fingerprint: B434 53FC C87C FE7B 0A18 B84C 8686 EF22 D300 551E ------------------------------------------------------------------
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