Am 19.08.2011 14:28, schrieb Andrew Cooper:
On 15/08/11 13:52, Andreas Olsowski wrote:
On 08/15/2011 12:49 PM, Simon Rowe wrote:
I've found adding
options megaraid_sas poll_mode_io=1
makes both of the systems we're seeing this on stable.
ive been told to try that one and it works for me too (been running test
io for roughly 5 minutes now).
driver version
megasas: 00.00.05.30 Tue. Jan. 4 17:00:00 PDT 2011
Hello - I am now debugging.
It seems that the megaraid_sas driver will try and use either MSI-X or
legacy PCI interrupts mode, but will never try to use MSI. The box we
can reproduce the problem on has MSI support but not MSI-X support.
As an experiment, I put a single call to pci_enable_msi() in the
megasas_probe_one() function, immediately after pci_set_master(). I now
cannot reproduce the problem.
Do any of the boxes you have which reproduce the problem set up MSI-X
interrupts for the megasas driver, or are they all using legacy PCI
interrupts?
(I am also emailing an LSI contact asking why they do not use MSI
interrupts)
~Andrew
No the affected systems DO NOT use MSI-X
Below is output from 3 Servers, xenturio1 and tarballerina are affected
(same old raid controller) whereas netcatarina is not (newer raid
controller).
May i add, the 1078 series raid controller isnt listed on the LSI
homepage, the 9260 is.
The affected servers are Dell PE2950 and R710.
Unaffectes is are the R610s.
Hope this helps, below is some output of the servers:
root@xenturio1:~# cat /proc/interrupts |grep mega
16: 2545 0 0 0 0 0
0 0 xen-pirq-ioapic-level megasas
root@xenturio1:~# lspci |grep LSI
01:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 1078
(rev 04)
root@tarballerina:~# cat /proc/interrupts |grep mega
33: 47264 0 0 0 0 0
0 0 xen-pirq-ioapic-level megasas
root@tarballerina:~# lspci |grep LSI
03:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 1078
(rev 04)
root@netcatarina:~# cat /proc/interrupts |grep mega
2237: 88684 0 0 0 0 0
0 0 xen-pirq-msi-x megasas
root@netcatarina:~# lspci |grep LSI
03:00.0 RAID bus controller: LSI Logic / Symbios Logic LSI MegaSAS 9260
(rev 05)
--
Andreas Olsowski
Leuphana Universität Lüneburg
Rechen- und Medienzentrum
Scharnhorststraße 1, C7.015
21335 Lüneburg
Tel: ++49 4131 677 1309
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