Date: Thu, 30 Oct 1997 01:18:14 +1030 From: Mike Smith <mike@smith.net.au> To: Mikael Karpberg <karpen@ocean.campus.luth.se> Cc: dg@root.com, hackers@FreeBSD.ORG Subject: Re: Parity Ram Message-ID: <199710291448.BAA01029@word.smith.net.au> In-Reply-To: Your message of "Wed, 29 Oct 1997 03:29:12 BST." <199710290229.DAA07708@ocean.campus.luth.se>
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> > Hmm... It's still not quite clear to me. That is, does this slow my > computer down, in case I use ECC? Slightly, yes. Unless you stand over it measuring things microscopically, you won't notice the difference. > It seems to me all this could be done on the DIMM/SIMM, or something, > possibly clocked at multiple of the bus clockspeed, and therefor > not effect the rate at which memory could be read/written over the bus > by the CPU. It's faster and cheaper to do it inside the memory pipeline. > If that's not the case, and the computer is actually slowed down by ECC, > how much performace do you loose? 0.1%? 5%? 30%? That depends; what's your system doing? The tests we did put the change down in the noise (<2%) for our workload. mike
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