Date: Sat, 12 Nov 2005 18:37:11 +1100 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: Pyun YongHyeon <pyunyh@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: poor fdc(4) performance Message-ID: <20051112073711.GE39882@cirb503493.alcatel.com.au> In-Reply-To: <20051112071815.GD18405@rndsoft.co.kr> References: <20051112071815.GD18405@rndsoft.co.kr>
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On Sat, 2005-Nov-12 16:18:15 +0900, Pyun YongHyeon wrote: >I encountered a P3 SMP system that shows poor fdc(4) performance. >But when I use larger block size, say 36b, it seems it works >as expected. 36b is one track. My suspicion is that the system isn't fast enough to read sequential blocks, one at a time, so you're forced to wait a complete revolution (plus a bit) for each block you read. -- Peter Jeremy
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