Dell SAS5 Performance Issue

[Bjoern A. Zeeb]

On Tue, 27 Mar 2007, Matthew Jacob wrote:

> On 3/27/07, Richard Tector <richardtector at thekeelecentre.com> wrote:
>> Thank you for the quick reply.
>> Is there any information I could obtain that would be of use to you in
>> tracking this one down?
>
> not at the momeny- it's really that I won't have time until april

As said, I won't have the chance to test anything from this evening on
and I had a few minutes so I added the usual printfs to get the
detailed information for the reported mpt_cam_event()s.

: grep ^mpt dell_pe860-20070328-02.log
mpt0: <LSILogic SAS/SATA Adapter> port 0xec00-0xecff mem 0xfe9fc000-0xfe9fffff,0xfe9e0000-0xfe9effff irq 16 at device 8.0 on pci2
mpt0: Reserved 0x100 bytes for rid 0x10 type 4 at 0xec00
mpt0: Reserved 0x4000 bytes for rid 0x14 type 3 at 0xfe9fc000
mpt0: [GIANT-LOCKED]
mpt0: MPI Version=1.5.12.0
mpt0: Event on.
mpt0: SAS discovery started.
mpt0: SAS PHY(0x00) link status: Rate: 3.0 Gbps.
mpt0: SAS PHY(0x01) link status: Rate: 3.0 Gbps.
mpt0: SAS discovery done.

That's also what the controller reports (but I think the driver does
not try to re-neg/discover anything itself here?).

Most likely that's it from me on the write performance topic.

-- 
Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT