Re: blk-mq problem on proliant DL380 G3 (cciss)

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> >> On Wed, Oct 29, 2014 at 09:08:46AM -0600, Jens Axboe wrote:
> >>>> Another test server with MPT SCSI RAID has similar problem,
> >>>> scsi_mode.use_blk_mq=0 cures it but I can not get good trace (no serail
> >>>> console). 3.18.0-rc2-00043-gf7e87a4 was tested there.
> >>>
> >>> The first issue looks like scsi cdrom and error handling, it must be leaking
> >>> requests hence we hang on allocation of a new one. cciss doesn't use blk_mq
> >>> regardless of the scsi setting. Does the mpt box also have a libata driven
> >>> cdrom?
> >>
> >> cciss does use scsi for CDROMs and other external devices, it is a bit
> >> of a mess.
> >>
> >> Meelis, did you also test scsi-mq on 3.17 and this is a regression, or
> >> was 3.18-rc2 the first kernel you tested?
> > 
> > Both machines ran 3.17 successfully. I turned on scsi-mq option as soon 
> > as it appeared in Kconfig as a new option. But I am not sure whan the 
> > option appeared, before or after 3.17 release.
> 
> So just to be fully clear, you never enabled scsi-mq on 3.17? To do
> that, you would have had to add a scsi_mod.use_blk_mq=1 boot parameter.
> The scsi-mq kconfig option did not show up until after 3.17 release.

Yes, I never enabled it via command line, only noticed it when the 
question was asked during make oldconfig. Will try 3.17 with use_blk_mq 
today.

-- 
Meelis Roos (mroos@xxxxxxxx)
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