Date: Wed, 31 May 2006 09:14:07 -0600 From: Scott Long <scottl@samsco.org> To: Dan Nelson <dnelson@allantgroup.com> Cc: Rod Person <rodperson@adelphia.net>, freebsd-current@freebsd.org Subject: Re: Current 7 U320 transfer rate only 3.300 MB/s Message-ID: <447DB2BF.5010609@samsco.org> In-Reply-To: <20060531150634.GD6982@dan.emsphone.com> References: <200605301914.41981.rodperson@adelphia.net> <20060531150634.GD6982@dan.emsphone.com>
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Dan Nelson wrote: > In the last episode (May 30), Rod Person said: > >>I have and LSI u320 SCSI controller on a TYAN Thunder K8WE board with >>and nvidia4 chipset. My boot message displays the following >> >>da0 at mpt0 bus 0 target 0 lun 0 >>da0 <FUJITSU MAP3735NP 5605> FIXED Direct Access SCSI-3 device >>da0 3.300MB/s tranfers, Tagged Queueing Enabled >> >>Why is my transfer rate so low? Anyone have an idea how I can correct >>this? > > > That may just be a display bug. Does "diskinfo -t da0" report > reasonable speeds? If not, check your bios to see if you are forcing a > slow speed, or try running "camcontrol negotiate da0 -R 160" to force > 320MB speeds (160 Mhz * 16 bit bus = 320MB). > It's a bug in the MPT driver, though it usually only manifests itself with 4 or more drives. Scott
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