Re: mpt Serious performance issues

[Stephan <stephanwib%googlemail.com@localhost>]

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?

As for the mpt driver, I think i will build a custom kernel containing
some diagnostic lines.