linux-kernel - Re: [Xen-devel] [PATCH RFC 00/12] xen-block: indirect descriptors

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Date:	Thu, 28 Feb 2013 12:25:29 +0100
From:	Roger Pau Monné <roger.pau@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH RFC 00/12] xen-block: indirect descriptors

On 28/02/13 11:49, Jan Beulich wrote:
>>>> On 28.02.13 at 11:28, Roger Pau Monne <roger.pau@...rix.com> wrote:
>> This series contains the initial implementation of indirect 
>> descriptors for Linux blkback/blkfront.
>>
>> Patches 1, 2, 3, 4 and 5 are bug fixes and minor optimizations.
>>
>> Patch 6 contains a LRU implementation for blkback that will be needed 
>> when using indirect descriptors (since we are no longer able to map 
>> all possible grants blkfront might use).
> 
> Considering this, ...
> 
>> Patch 7 is an addition to the print stats function in blkback in order 
>> to print information regarding persistent grant usage.
>>
>> Patches 8, 9, 10 and 11 are preparatory work for indirect descriptors 
>> implementation, mainly make blkback use dynamic memory and remove the 
>> shared blkbk structure, so each blkback instance has it's own list of 
>> free requests, pages, handles and so on.
>>
>> Finally patch 12 contains the indirect descriptors implementation.
>>
>> I've also pushed this series to the following git repository:
>>
>> git://xenbits.xen.org/people/royger/linux.git xen-block-indirect
>>
>> Performance benefit of this series can be seen in the following graph:
>>
>> http://xenbits.xen.org/people/royger/plot_indirect.png 
> 
> ... would you happen to also have a comparison with using
> indirect descriptors but not persistent grants? IOW I'm
> wondering about the hit rate on the persistently mapped
> grants, especially when blkfront really saturates the added
> bandwidth.

This is the expanded graph that also contains indirect descriptors
without persistent grants:

http://xenbits.xen.org/people/royger/plot_indirect_nopers.png

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