Date: Thu, 2 May 1996 04:24:59 +1000 From: Bruce Evans <bde@zeta.org.au> To: luigi@labinfo.iet.unipi.it, terry@lambert.org Cc: current@freebsd.org, hackers@freebsd.org, koshy@india.hp.com, msmith@atrad.adelaide.edu.au Subject: Re: lmbench IDE anomaly Message-ID: <199605011824.EAA05707@godzilla.zeta.org.au>
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>> The disksort stuff is pessimal. Contact mday@elbereth.org for details. >The original poster was doing a couple of lmdd from /dev/rwd0a, the raw >device. Does disksort get in the way in this case ? Of course not. >BTW, running a number of dd on /dev/wd0a works *much* better, you get >almost n times the bandwidth at least with up to 5 instances, what I >tried. /dev/wd0a is a completely different device from /dev/rwd0a. dd on it tests the buffer cache and the too-small block size of BLKDEV_IOSIZE = 2048. Bruce
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