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Date:      Sun, 8 Oct 1995 00:35:34 +0100
From:      se@zpr.uni-koeln.de (Stefan Esser)
To:        "Kenneth D. Merry" <ken@rflab1.gtri.gatech.edu>
Cc:        hackers@freebsd.org
Subject:   Re: VLB Disk Controllers
Message-ID:  <199510072335.AA14520@Sysiphos>
In-Reply-To: "Kenneth D. Merry" <ken@rflab1.gtri.gatech.edu> "Re: VLB Disk Controllers" (Oct  7, 19:13)

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On Oct 7, 19:13, "Kenneth D. Merry" wrote:
} Subject: Re: VLB Disk Controllers

} Adaptec 2842 on a i486DX4/100 VLB (QUANTUM XP34300) (Atlas, fast disk)
} output for disklatency /dev/rsd0:
} Command overhead is 567 usec (time_4096 = 1002, time_8192 = 1438)
} transfer speed is 9.40748e+06 bytes/sec

Well, you beat me, though not by much :)

But then, you used a DX4/100 ...

Something I just noticed is the big difference 
in results I get using /dev/rsd0 vs. /dev/rsd0a:

# disklatency /dev/rsd0
Command overhead is 719 usec (time_4096 = 1198, time_8192 = 1677)
transfer speed is 8.55617e+06 bytes/sec

# disklatency /dev/rsd0a
Command overhead is 807 usec (time_4096 = 1272, time_8192 = 1738)
transfer speed is 8.80588e+06 bytes/sec

Any ideas ???

STefan

-- 
 Stefan Esser, Zentrum fuer Paralleles Rechnen		Tel:	+49 221 4706021
 Universitaet zu Koeln, Weyertal 80, 50931 Koeln	FAX:	+49 221 4705160
 ==============================================================================
 http://www.zpr.uni-koeln.de/staff/esser/esser.html	  <se@ZPR.Uni-Koeln.DE>



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