Date: Sun, 08 May 2005 07:09:11 -0600 From: Scott Long <scottl@samsco.org> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-current@freebsd.org Subject: Re: Very low disk performance Highpoint 1820a Message-ID: <427E0F77.50006@samsco.org> In-Reply-To: <002b01c553be$93a5b790$b3db87d4@multiplay.co.uk> References: <069901c54bfd$2967ba40$7f06000a@int.mediasurface.com> <427D5AA0.1080609@withagen.nl> <002b01c553be$93a5b790$b3db87d4@multiplay.co.uk>
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Steven Hartland wrote: > If that where the case it would have been it wouldn't have been > 46Mb/s it would have been 543Mb/s, just tested it for you :P The RR1280 cards are really just software RAID cards. All of the parity calculations are done by the CPU. I couldn't find much evidence that the driver has parity routines that are optimized for the CPU, so it's likely doing a very inefficient job at it. Scott
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