Re: mpt Serious performance issues

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Fri, Jan 28, 2011 at 12:26:36PM +0100, Stephan wrote:
> The mpt driver prints the following:
> 
> mpt0 at pci3 dev 1 function 0: Symbios Logic 53c1020/53c1030
> ioapic1: int4 1a9a8<vector=a8,delmode=1,logical,actlo,level,masked,dest=0>
> f000000<target=f>
> mpt0: interrupting at ioapic1 pin 4, event channel 3
> scsibus0 at mpt0: 16 targets, 8 luns per target
> 
> The Raid-Set appears as:
> 
> sd0 at scsibus0 target 0 lun 0: <LSILOGIC, 1030 IM       IM, 1000> disk fixed
> sd0: fabricating a geometry
> sd0: 69994 MB, 69994 cyl, 64 head, 32 sec, 512 bytes/sect x 143347995 sectors
> sd0: sync (6.25ns offset 127), 16-bit (320.000MB/s) transfers, tagged queueing
> 
> Is tagged queueing set individually for each (virtual) disk or for a
> SCSI or RAID controller?

for each disk (virtual or real). It's a property of the disk, not
so much of the controller (although for smart controllers, support
is also needed in firmware).

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--