linux-kernel - Re: [Ksummit-2013-discuss] [ATTEND] scsi-mq prototype discussion

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1374268967.7397.1075.camel@haakon3.risingtidesystems.com>
Date:	Fri, 19 Jul 2013 14:22:47 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	James Bottomley <jbottomley@...allels.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Hannes Reinecke <hare@...e.de>,
	"ksummit-2013-discuss@...ts.linuxfoundation.org" 
	<ksummit-2013-discuss@...ts.linuxfoundation.org>,
	James Smart <James.Smart@...lex.Com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"kmo@...erainc.com" <kmo@...erainc.com>,
	target-devel <target-devel@...r.kernel.org>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	Tejun Heo <tj@...nel.org>, Christoph Hellwig <hch@....de>,
	"scameron@...rdog.cce.hp.com" <scameron@...rdog.cce.hp.com>,
	Mike Christie <michaelc@...wisc.edu>
Subject: Re: [Ksummit-2013-discuss] [ATTEND] scsi-mq prototype discussion

On Wed, 2013-07-17 at 04:52 +0000, James Bottomley wrote:
> On Tue, 2013-07-16 at 15:15 -0600, Jens Axboe wrote:
> > On Tue, Jul 16 2013, Nicholas A. Bellinger wrote:
> > > On Sat, 2013-07-13 at 06:53 +0000, James Bottomley wrote:

<SNIP>

> > > > Lets start with discussing this on the list, please, and then see where
> > > > we go from there ...
> > > > 
> > > 
> > > Yes, the discussion is beginning to make it's way to the list.  I've
> > > mostly been waiting for blk-mq to get a wider review before taking the
> > > early scsi-mq prototype driver to a larger public audience.
> > > 
> > > Primarily, I'm now reaching out to the people most effected by existing
> > > scsi_request_fn() based performance limitations.  Most of them have
> > > abandoned existing scsi_request_fn() based logic in favor of raw block
> > > make_request() based drivers, and are now estimating the amount of
> > > effort to move to an scsi-mq based approach.
> > > 
> > > Regardless, as the prototype progresses over the next months, having a
> > > face-to-face discussion with the key parties in the room would be very
> > > helpful given the large amount of effort involved to actually make this
> > > type of generational shift in SCSI actually happen.
> > 
> > There's a certain amount of overlap with the aio/O_DIRECT work as well.
> > But if it's not a general session, could always be a BOF or something.
> > 
> > I'll second the argument that most technical topics probably DO belong
> > in a topic related workshop. But that leaves us with basically only
> > process related topics at KS, I don't think it hurts to have a bit of
> > tech meat on the bone too. At least I personally miss that part of KS
> > from years gone by.
> 
> Heh well, given that most of the block mq discussions at LSF have been
> you saying you really should get around to cleaning up and posting the
> code, you'll understand my wanting to see that happen first ...
> 
> I suppose we could try to run a storage workshop within KS, but I think
> most of the mini summit slots have already gone.

That would be great, given there is a reasonable level of interest from
various parities, and the pain threshold for existing scsi small block
random I/O performance is high..

When will we know if there is a workshop / mini summit slot available..?

(CC'ing Mike Christie as well for open-iscsi/scsi-mq bits)

> There's also plumbers
> if all slots are gone (I would say that, being biased and on the
> programme committee) Ric is running the storage and Filesystems MC
> 
> http://www.linuxplumbersconf.org/2013/ocw/events/LPC2013/tracks/159

FYI, I'm not trying to 'sell' scsi-mq to the larger community yet, but
rather interested in getting the right scsi/block/LLD people in the same
room at KS for an hour or two to discuss implementation details, given
the scope of the effort involved.

--nab

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/