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Date: Thu, 07 Apr 2005 11:21:49 +1000
From: Carl Makin <carl@xena.IPAustralia.gov.au>
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To: Eugene Mitrofanov <eugene@imedia.ru>
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cc: freebsd-stable@freebsd.org
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Subject: Re: IBM eServer 346 ServeRaid is too slow
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Hi Eugene,

Eugene Mitrofanov wrote:

>I've got Subj and FreeBSD-5.4PRE on it. But RAID0 is too slow:
>root@beta:eugene# dd if=/dev/zero of=/var/tmp/1 bs=1m count=100
>100+0 records in
>100+0 records out
>104857600 bytes transferred in 31.949508 secs (3281979 bytes/sec)
>
>mpt0: <LSILogic 1030 Ultra4 Adapter> port 0x4000-0x40ff mem 
>0xcffe0000-0xcffeffff,0xcfff0000-0xcfffffff irq 28 at device 1.0 on pci4
>  
>
>da0 at mpt0 bus 0 target 0 lun 0
>da0: <LSILOGIC 1030 IM       IM 1000> Fixed Direct Access SCSI-2 device 
>da0: 320.000MB/s transfers (160.000MHz, offset 127, 16bit), Tagged Queueing 
>Enabled
>da0: 34678MB (71020544 512 byte sectors: 255H 63S/T 4420C)
>  
>
I'd say you are seeing the same as I am with the same card in a Dell 
1855.  There is something wrong with the mpt driver and the disks when 
they are setup in a raid0 set.  If you split the disks and use them as 
individual drives then you will get full performance. 


Carl.