Re: 2.6.31-rc9 kernel BUG and mvsas

From: Andre Tomt
Date: Tue Nov 03 2009 - 20:05:19 EST

Andre Tomt wrote:
Jeff Garzik wrote:
On 09/09/2009 12:30 PM, Thomas Fjellstrom wrote:
No errors on that disk. Other than the one above, and its more of a warning.
However, I just rebooted to add some extra drives, thinking everything was
working a little better now that I've updated to 2.6.31-rc9, I'm treated to
the following two messages right after boot (and a system lockup to boot):

Jeff & Co,

Just chiming in with a "me too" comment.

Identical issues with the AOC-SASLP-MV8 card with 8 Seagate Barracuda 7200.11 1.5TB drives using the mvsas driver. Creating a md raid array seems to trigger it nearly instantly, however other loads do not trigger it as fast (if at all, only tested briefly with paralell dd).

Not sure if its related in any way, but I also noticed that with parallell dd read on all ports, the card/driver tops out at 600MB/s even though the card is in a northbridge connected slot running in x4 mode. Only the first 4-5 ports run at nearly full speed, while the rest barely gets to read any data at all. To illustrate, it looks sort of like this in iostat -m:
sda 122
sdb 122
sbc 120
sdd 121
sde 100
sdf 10
sdg 5
sdh 5

Starting to think this driver has some issues with concurrency.. The other controllers have no issues saturating all their ports, even if they are on a south bridge connected slot.

Err, saturating all the disks. I'm not expecting 300MB/s*8, even though it would be very cool 8)

Same disks/setup works just fine on AHCI and sata_mv controllers on the same computer, easily pushes 8-900MB/s with md software raid5/6 (Yipes!)

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