linux-kernel - Re: SCSI driver for VMware's virtual HBA

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Message-ID: <20091013220013.GB2908@sequoia.sous-sol.org>
Date:	Tue, 13 Oct 2009 15:00:13 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Alok Kataria <akataria@...are.com>
Cc:	Chris Wright <chrisw@...s-sol.org>,
	James Bottomley <James.Bottomley@...e.de>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Mike Christie <michaelc@...wisc.edu>,
	Bart Van Assche <bvanassche@....org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	Matthew Wilcox <matthew@....cx>,
	"pv-drivers@...are.com" <pv-drivers@...are.com>,
	Roland Dreier <rdreier@...co.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Chetan.Loke@...lex.Com" <Chetan.Loke@...lex.Com>,
	Brian King <brking@...ux.vnet.ibm.com>,
	Rolf Eike Beer <eike-kernel@...tec.de>,
	Robert Love <robert.w.love@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Walker <dwalker@...o99.com>, Greg KH <gregkh@...e.de>,
	"virtualization@...ts.linux-foundataion.org" 
	<virtualization@...ts.linux-foundataion.org>
Subject: Re: SCSI driver for VMware's virtual HBA - V5.

* Alok Kataria (akataria@...are.com) wrote:
> On Mon, 2009-10-12 at 22:37 -0700, Chris Wright wrote:
> > > +     pvscsi_template.can_queue =
> > > +             min(PVSCSI_MAX_NUM_PAGES_REQ_RING, pvscsi_ring_pages) *
> > > +             PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
> > > +     pvscsi_template.cmd_per_lun =
> > > +             min(pvscsi_template.can_queue, pvscsi_cmd_per_lun);
> > 
> > When/how are these tunables used?  Are they still useful?
> 
> cmd_per_lun, is a commandline parameter.

Actually I meant how is a user supposed to use these?  They looked to me
like tunables that were part of developing a driver that may not be
needed any longer.  What are the right values, what are the tradeoffs,
etc?  Or should they just be removed?

thanks,
-chris
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