[Bug 242773] ata driver as module, interrupt storm on atapci0 and low attachment speed for disks

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242773

            Bug ID: 242773
           Summary: ata driver as module, interrupt storm on atapci0 and
                    low attachment speed for disks
           Product: Base System
           Version: 11.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: emss at free.fr

Created attachment 210107
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=210107&action=edit
11.3-STABLE dmesg for SE7525GP2

Hi,

Intel SE7525GP2 MB (quite old, I know)

When using MINIMAL and trying to load atapci as module, atapci reports low
speed for attached disks :

ada4 at ata2 bus 0 scbus4 target 0 lun 0
ada4: <SanDisk SSD PLUS 120GB UE4500RL> ACS-2 ATA SATA 3.x device
ada4: Serial Number 1841B1803114
ada4: 33.000MB/s transfers (UDMA2, PIO 512bytes)
ada4: 114480MB (234455040 512 byte sectors)

Kernel spits messages about interrupt storm on irq used by atapci.

When ata support is compiled into kernel, the reported speed is fine :

ada4 at ata2 bus 0 scbus4 target 0 lun 0
ada4: <SanDisk SSD PLUS 120GB UE4500RL> ACS-2 ATA SATA 3.x device
ada4: Serial Number 1841B1803114
ada4: 150.000MB/s transfers (SATA 1.x, UDMA5, PIO 512bytes)
ada4: 114480MB (234455040 512 byte sectors)

I've reproduced the same issue using a freshly compiled 12.1-STABLE kernel

Regards

Éric Masson

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