Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics -- Fedora Linux Users


Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
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Subject: Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
From: "Loke, Chetan" <Chetan.Loke@xxxxxxxxxxxx>
Date: Wed, 25 Jan 2012 11:22:01 -0500
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, linux-scsi@xxxxxxxxxxxxxxx, Mike Snitzer <snitzer@xxxxxxxxxx>, dm-devel@xxxxxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Jeff Moyer <jmoyer@xxxxxxxxxx>, Wu Fengguang <fengguang.wu@xxxxxxxxx>, Boaz Harrosh <bharrosh@xxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, lsf-pc@xxxxxxxxxxxxxxxxxxxxxxxxxx, Chris Mason <chris.mason@xxxxxxxxxx>
In-reply-to: <1327502034.2720.23.camel@menhir>
References: <20120124151504.GQ4387@shiny> <20120124165631.GA8941@infradead.org> <186EA560-1720-4975-AC2F-8C72C4A777A9@dilger.ca> <x49fwf5kmbl.fsf@segfault.boston.devel.redhat.com> <20120124184054.GA23227@infradead.org> <20120124190732.GH4387@shiny> <x49vco0kj5l.fsf@segfault.boston.devel.redhat.com> <20120124200932.GB20650@quack.suse.cz> <x49pqe8kgej.fsf@segfault.boston.devel.redhat.com> <20120124203936.GC20650@quack.suse.cz> <20120125032932.GA7150@localhost> <F6F2DEB8-F096-4A3B-89E3-3A132033BC76@dilger.ca> <1327502034.2720.23.camel@menhir>
Reply-to: device-mapper development <dm-devel@xxxxxxxxxx>
Thread-index: AczbbmXZ1z4v/UtbSUOV6giTf54/HgADnh+w
Thread-topic: [Lsf-pc] [LSF/MM TOPIC] a few storage topics

 
> If the reason for not setting a larger readahead value is just that it
> might increase memory pressure and thus decrease performance, is it
> possible to use a suitable metric from the VM in order to set the value
> automatically according to circumstances?
> 

How about tracking heuristics for 'read-hits from previous read-aheads'? If the hits are in acceptable range(user-configurable knob?) then keep seeking else back-off a little on the read-ahead?

> Steve.

Chetan Loke

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References:
- Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
  - From: Chris Mason
- Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
  - From: Christoph Hellwig
- Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
  - From: Andreas Dilger
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  - From: Christoph Hellwig
- Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
  - From: Chris Mason
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  - From: Jeff Moyer
- Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
  - From: Jan Kara
- Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
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  - From: Jan Kara
- Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
  - From: Wu Fengguang
- Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
  - From: Andreas Dilger
- Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
  - From: Steven Whitehouse

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