[Bug 269807] mrsas reports incorrect transfers value

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 24 Feb 2023 19:56:11 UTC

            Bug ID: 269807
           Summary: mrsas reports incorrect transfers value
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: dvl@FreeBSD.org

I'm running the mrsas driver with FreeBSD 13.1 on a Dell R730.

AVAGO MegaRAID SAS FreeBSD mrsas driver version: 07.709.04.00-fbsd
mrsas0: <AVAGO Invader SAS Controller> port 0x3000-0x30ff mem
0x92600000-0x9260ffff,0x92500000-0x925fffff irq 26 at device 0.0 numa-domain 0
on pci3

The SSDs connected to this HBA report: 150.000MB/s transfers, for example:

da8 at mrsas0 bus 1 scbus1 target 8 lun 0
da8: <ATA WDC  WDS400T2B0A 20WD> Fixed Direct Access SPC-4 SCSI device
da8: Serial Number 230151801478        
da8: 150.000MB/s transfers
da8: 3815447MB (7814037168 512 byte sectors)

However, a test of that drive shows sppeds of about 460 MB/s, far about that
reported level.

Could the mrsas driver be wrong about what it's saying?

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