Date: Fri, 22 Oct 2004 15:29:42 +0200 From: des@des.no (=?iso-8859-1?q?Dag-Erling_Sm=F8rgrav?=) To: fandino@ng.fadesa.es Cc: freebsd-current@freebsd.org Subject: Re: FreeBSD 5.3b7and poor ata performance Message-ID: <xzp6552yj7d.fsf@dwp.des.no> In-Reply-To: <41763534.2060505@ng.fadesa.es> (fandino@ng.fadesa.es's message of "Wed, 20 Oct 2004 11:51:48 %2B0200") References: <94275.1098221474@critter.freebsd.dk> <41763534.2060505@ng.fadesa.es>
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fandino <fandino@ng.fadesa.es> writes: > yes, I run dd, bonnie++, bonnie and reports are very clear, there is > a problem with performance and the ata system (I think). There is no problem with the ATA subsystem in general. I have no trouble getting 40 MBps with raw sequential reads on my laptop and 50 MBps on my desktop (both running -CURRENT with INVARIANTS but no WITNESS, and both with fairly old disks). Unfortunately, my AMD64 box is not online right now or I could give you the numbers for its brand- new SATA150 drive under 5.3 BETA7. There may be problems with your particular hardware and / or software configuration, but you're not likely to get those solved by being so confrontational. As regards block sizes: there *is* a definite increase in performance - almost a full order of magnitude - going from 512 B to 64 kB. For larger block sizes, you will get a smaller improvement simply from amortizing the syscall overhead over larger transfers. I have no idea how Emmanuel Strobl managed to test performance with block sizes of 128 B and 256 B since the transfer size for an ATA disk needs to be a multiple of 512 B. DES --=20 Dag-Erling Sm=F8rgrav - des@des.no
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