linux-kernel - Re: [PATCH 04/10] xen/blkfront: separate ring information to an new struct

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Message-ID: <20150304212140.GA18253@l.oracle.com>
Date:	Wed, 4 Mar 2015 16:21:40 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Bob Liu <bob.liu@...cle.com>
Cc:	Roger Pau Monné <roger.pau@...rix.com>,
	Felipe Franciosi <felipe.franciosi@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"axboe@...com" <axboe@...com>,
	"hch@...radead.org" <hch@...radead.org>,
	"avanzini.arianna@...il.com" <avanzini.arianna@...il.com>
Subject: Re: [PATCH 04/10] xen/blkfront: separate ring information to an new
 struct

> > David assertion that better performance and scalbility can be gained
> > with grant table locking and TLB flush avoidance is interesting - as
> > 1). The grant locking is going in Xen 4.6 but not earlier - so when running
> >     on older hypervisors this gives an performance benefit.
> > 
> > 2). I have not seen any prototype TLB flush avoidance code so not know
> >     when that would be available.
> > 
> > Perhaps a better choice is to do the removal of the persistence support
> > when the changes in Xen hypervisor are known?
> > 
> 
> With patch: [PATCH v5 0/2] gnttab: Improve scaleability, I can get
> nearly the same performance as without persistence support.
> 
> But I'm not sure about the benchmark described here:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/block/xen-blkfront.c?id=0a8704a51f386cab7394e38ff1d66eef924d8ab8

Meaning you weren't able to do the same test?

> 
> -- 
> Regards,
> -Bob
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