Date: Tue, 30 Apr 1996 22:18:02 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: rgrimes@GndRsh.aac.dev.com (Rodney W. Grimes) Cc: koshy@india.hp.com, hackers@freebsd.org, current@freebsd.org Subject: Re: lmbench IDE anomaly Message-ID: <199604302018.WAA07626@labinfo.iet.unipi.it> In-Reply-To: <199604301634.JAA13493@GndRsh.aac.dev.com> from "Rodney W. Grimes" at Apr 30, 96 09:34:02 am
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[about two concurrent benchmarks on one disk, and a 4x throughput degradation on IDE] > > Is this to be expected, or am i doing something wrong here? The system was > > otherwise idle during these tests. > > run those command with a ``time'' in front of them as in: > time lmdd if=/dev/rwd0a of=internal bs=1024 count=8192 # IDE disk > > You may be seeing CPU saturation effecting the ability of the system to It would be interesting to check if it is CPU saturation, or it is a bad interaction with disksort as someone suggested. I really don't know what to say because the total overhead due to rep insw is proportional to the total throughput, so it should be reduced. Luigi ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 http://www.iet.unipi.it/~luigi/ ====================================================================
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