linux-kernel - Re: [PATCH RFC - TAKE TWO - 08/12] block, bfq: preserve a low latency also with NCQ-capable drives

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Message-ID: <20140531134823.GB24557@mtj.dyndns.org>
Date:	Sat, 31 May 2014 09:48:23 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Paolo Valente <paolo.valente@...more.it>
Cc:	Jens Axboe <axboe@...nel.dk>, Li Zefan <lizefan@...wei.com>,
	Fabio Checconi <fchecconi@...il.com>,
	Arianna Avanzini <avanzini.arianna@...il.com>,
	Paolo Valente <posta_paolo@...oo.it>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org
Subject: Re: [PATCH RFC - TAKE TWO - 08/12] block, bfq: preserve a low
 latency also with NCQ-capable drives

On Thu, May 29, 2014 at 11:05:39AM +0200, Paolo Valente wrote:
> This patch addresses this issue by not disabling device idling for

This patch addresses this issue by allowing device idling for...

> weight-raised queues, even if the device supports NCQ. This allows BFQ
> to start serving a new queue, and therefore allows the drive to

This disallows BFQ to start serving a new queue, and therefore the
drive to prefetch new requests, until the idling timeout expires.

Prefetch?  Can you elaborate?

Thanks.

-- 
tejun
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