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[dm-devel] Re: [PATCH 12/23] io-controller: Wait for requests to complete from last queue before new queue is scheduled

From: Rik van Riel <riel redhat com>
To: Vivek Goyal <vgoyal redhat com>
Cc: dhaval linux vnet ibm com, peterz infradead org, dm-devel redhat com, dpshah google com, jens axboe oracle com, agk redhat com, balbir linux vnet ibm com, paolo valente unimore it, jmarchan redhat com, guijianfeng cn fujitsu com, fernando oss ntt co jp, mikew google com, jmoyer redhat com, nauman google com, mingo elte hu, m-ikeda ds jp nec com, lizf cn fujitsu com, fchecconi gmail com, s-uchida ap jp nec com, containers lists linux-foundation org, linux-kernel vger kernel org, akpm linux-foundation org, righi andrea gmail com, torvalds linux-foundation org
Subject: [dm-devel] Re: [PATCH 12/23] io-controller: Wait for requests to complete from last queue before new queue is scheduled
Date: Sat, 29 Aug 2009 20:40:04 -0400

Vivek Goyal wrote:

o Because above behavior can result in reduced throughput, this behavior will
  be enabled only if user sets "fairness" tunable to 1.

o This patch helps in achieving more isolation between reads and buffered

writes in different cgroups.


Could be a nice help against SATA NCQ request starvation.

Signed-off-by: Vivek Goyal <vgoyal redhat com>


Acked-by: Rik van Riel <riel redhat com>

--
All rights reversed.

References:
- [dm-devel] [RFC] IO scheduler based IO controller V9
  - From: Vivek Goyal
- [dm-devel] [PATCH 12/23] io-controller: Wait for requests to complete from last queue before new queue is scheduled
  - From: Vivek Goyal

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