Date: Fri, 28 Oct 2005 18:41:19 -0400 From: Mikhail Teterin <mi+mx@aldan.algebra.com> To: =?iso-8859-1?q?S=F8ren_Schmidt?= <sos@freebsd.org> Cc: Peter Jeremy <PeterJeremy@optushome.com.au>, hackers@freebsd.org, hardware@freebsd.org Subject: Re: Very slow writing to SATA disk Message-ID: <200510281841.19751.mi%2Bmx@aldan.algebra.com> In-Reply-To: <D64EDD7D-644E-4DCD-8B99-450403234A5D@FreeBSD.ORG> References: <200510280518.j9S5I3oQ025430@blue.virtual-estates.net> <200510281803.15734.mi%2Bmx@aldan.algebra.com> <D64EDD7D-644E-4DCD-8B99-450403234A5D@FreeBSD.ORG>
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> Look in smartmontools I provided patches for that, its not rocket > science you know... This attitude -- on top of the API change itself -- is not really encouraging for ISVs, you know :-) > You need to find out what the transfer rates are for the RAW disk, ie > by doing a dd from /dev/zero to the disk with a a resonable blocksize > say 1M to minimize overhead. Also read speed from disk to /dev/null > blocksize 1M would be helpfull. The read test averaged 62603828 bytes/sec over a minute or so. The write test is only 6931231 bytes/sec -- about 9 times less. While dd is running, `systat 1 -vm' reports about 110 ata-interrupts (irq 25) per second during the write test, and about 1000 during the read test. Thanks for your help. -mi
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