Date: Sat, 08 Nov 1997 04:33:27 -0800 From: Amancio Hasty <hasty@rah.star-gate.com> To: Gordon Henderson <gordon@drogon.net> Cc: Stefan Esser <se@FreeBSD.ORG>, hackers@FreeBSD.ORG Subject: Re: Seagate Cheetah performance... Message-ID: <199711081233.EAA02814@rah.star-gate.com> In-Reply-To: Your message of "Sat, 08 Nov 1997 11:42:41 GMT." <Pine.LNX.3.95.971108113529.31803A-100000@unicorn>
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Hi, I think I now have my answer: dd if=/dev/rsd0f of=/dev/null bs=16k ^C41776+0 records in 41776+0 records out 684457984 bytes transferred in 51.149338 secs (13381561 bytes/sec) dd if=/dev/rwd0f of=/dev/null bs=16k ^C15902+0 records in 15902+0 records out 260538368 bytes transferred in 32.176591 secs (8097140 bytes/sec) The magic in my case was to fine tune my scsi adapter: options AHC_TAGENABLE options AHC_SCBPAGING_ENABLE options AHC_ALLOW_MEMIO Hope that this is an FAQ for web servers or file server configurations Amancio > On Sat, 8 Nov 1997, Stefan Esser wrote: > > > Please test all three drives with Bonnie. Use a test file at > > least twice as much as your system's RAM, and report your > > findings ... > > > > You'll get a different picture, I assume ! > > As Stefan says, you have to use a test file size more than your memory > system has, and the bigger the better, and bonnie is fairly universally > accepted, isn't it? > > To show you how misleading things can be, when a memory cache gets in the > way, heres a bonnie outout on a 32MB file (on a 256MB machine) > > -------Sequential Output-------- ---Sequential Input-- --Random-- > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- > MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU > 32 6321 96.0 26077 76.1 14800 91.8 6127 94.8 40595 94.4 3320.7 90.0 > > 40MB/sec read rate! Impressive, huh? (interesting to note how innefficient > character reading/writing is over block reading/writing!) > > Is there a Bonnie that copes with > 2GB files yet? I'm using one that I've > had for several years now... > > Gordon >
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