CC few more LSI driver developers.
> -----Original Message-----
> From: Nicholas A. Bellinger [mailto:n...@linux-iscsi.org]
> Sent: Monday, March 31, 2014 11:25 AM
> To: Matthew Wilcox
> Cc: linux-scsi@vger.kernel.org; wi...@linux.intel.com; Desai, Kashyap;
> Saxena, Sumit; James Bottomley
> Subject: Re: [PATCH 0/7] Performance improvements for LSI SCSI cards
>
> Hi Matthew,
>
> On Thu, 2014-03-27 at 16:40 -0400, Matthew Wilcox wrote:
> > The host lock is a serious scalability problem on 2-socket and larger
> > systems which are doing a lot of I/O. Before removing the temporary
> > usgae of DEF_SCSI_QCMD, we need to remove all uses of serial_number.
> >
> > An unrelated performance issue is that reusing the most recent
> > driver-specific data structure to track the I/O instead of the least
> > recently used keeps the cache-hot lines in use, which is a nice
> > performance improvement. It's already present in the mpt3sas driver,
> > it just didn't make it into the fusion or mpt2sas drivers yet.
> >
> > Matthew Wilcox (7):
> > mpt3sas: Remove uses of serial_number
> > mpt3sas: Remove use of DEF_SCSI_QCMD
> > mpt2sas: Remove uses of serial_number
> > mpt2sas: Remove use of DEF_SCSI_QCMD
> > mpt2sas: Add free smids to the head, not tail of list
> > fusion: Add free msg frames to the head, not tail of list
> > fusion: Remove use of DEF_SCSI_QCMD
> >
> >
>
> +1 to this long overdue series to enable host_lock-less mode with
> mpt*sas + fusion. (CC'ing LSI folks + jejb)
>
> Reviewed-by: Nicholas Bellinger <n...@linux-iscsi.org>
>
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